Bootstrap Scrollspy 和平滑滚动
Bootstrap Scrollspy & Smooth-Scroll
我在使用 scrollspy 和平滑滚动时遇到了一些问题。请记住,我是这个东西的新手,我的 google-fu 很好。 :)
这个问题非常令人沮丧,过去几天我一直在尝试很多不同的解决方案,但 none 似乎有效。我在包含 4 个部分的单个页面上使用 bootstrap scrollspy 和平滑滚动。每个部分在导航栏中都有自己的字形图标,当滚动到该部分时,它应该变成粉红色。当我单击第二个图标时,它按预期工作。当我点击第 3 个时,第 2 个保持粉红色,即处于活动状态。当我点击第 4 个时,第 3 个变成白色,第 2 个保持粉红色。此外,手动滚动时,只有前两个图标会改变颜色。如果您自己看到这种行为,可能会更容易。
http://codepen.io/bohemian83/pen/wMbRZK
这是我的代码。
<html>
<body data-spy="scroll" data-offset="50" data-target=".navbar">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
// navigation click actions
$('.scroll-link').on('click', function(event){
event.preventDefault();
var sectionID = $(this).attr("data-id");
scrollToID('#' + sectionID, 750);
});
// scroll to top action
$('.scroll-top').on('click', function(event) {
event.preventDefault();
$('html, body').animate({scrollTop:0}, 'slow');
});
// mobile nav toggle
$('#nav-toggle').on('click', function (event) {
event.preventDefault();
$('#main-nav').toggleClass("open");
});
});
// scroll function
function scrollToID(id, speed){
var offSet = 0;
var targetOffset = $(id).offset().top - offSet;
var mainNav = $('#main-nav');
$('html,body').animate({scrollTop:targetOffset}, speed);
if (mainNav.hasClass("open")) {
mainNav.css("height", "1px").removeClass("in").addClass("collapse");
mainNav.removeClass("open");
}
}
if (typeof console === "undefined") {
console = {
log: function() { }
};
}
</script>
<style>
@import url(https://fonts.googleapis.com/css?family=Poiret+One);
.google {
font-family:"Poiret One",sans-serif;
}
.navbar .navbar-brand {
color: white !important;
}
.navbar .navbar-nav > li > a {
color: white;
padding: 20px 30px 10px 30px;
}
.navbar {
background-color: transparent;
background: transparent;
border-color: transparent;
padding-top: 30px;
color: white;
}
.navbar .nav > li.current-menu-item > a, .navbar .nav > li.current-menu-ancestor > a,
.navbar .nav > li > a:hover, .navbar .nav > li > a:focus {
background-color: rgba(255,255,255,0);
color: pink;
}
ul.nav li.active a {
color: pink;
}
.glyphicon {
font-size: 20px;
}
.navbar-toggle .icon-bar {
display: block;
width: 22px;
height: 2px;
border-radius: 1px;
background-color: white /* change this to any color you want! */;
}
#first {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/wallpaper-1948122_zpsjnr4n9n2.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#second {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/meteora-10_zps7j9jqszn.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#third {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/duesseldorf_wertig_zps1hk1ollh.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#fourth{
background: url(https://i.ytimg.com/vi/24i8G5a5d5Q/maxresdefault.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: 100% 100%;
width: 100%;
height: 90%;
min-height:90%;
}
html, body, #first, #second, #third, #fourth {
height: 100%;
}
#myName {
font-weight: bold;
font-size: 50px;
}
@media (max-width: 768px){
.navbar-nav li{
text-align: right;
}
}
html, #first, #second, #third, #fourth {
height: 100%;
}
body {
position: relative;
}
#myName {
font-weight: bold;
font-size: 50px;
}
@media (max-width: 768px){
.navbar-nav li{
text-align: right;
}
}
</style>
<nav role="navigation" class="navbar navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand google" href="#" style="margin-left:80px" id="myName">PANAGIOTIS</a>
</div>
<div class="navbar-collapse collapse pull-right" style="margin-right:50px">
<ul class="nav navbar-nav">
<li><a class="scroll-link" data-id="first" href="#first"><span class="glyphicon glyphicon-home" id="ul-selected"></span></a></li>
<li><a class="scroll-link" data-id="second" href="#second"><span class="glyphicon glyphicon-user" id="ul-selected"></span></a></li>
<li><a class="scroll-link" data-id="third" href="third"><span class="glyphicon glyphicon-th" id="ul-selected"></span></a></li>
<li><a class="scroll-link" data-id="fourth" href="fourth"><span class="glyphicon glyphicon-envelope" id="ul-selected"></span></a></li>
</ul>
</div>
</div>
</div>
</nav>
<section id="first">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="second">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="third">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="fourth">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
</body>
</html>
更新:您的代码有效,只是您没有在导航列表中正确设置锚点 ID。
href="third"
和href="fourth"
应该是href="#third"
和href="#fourth"
查看工作示例代码段。
$(document).ready(function() {
// navigation click actions
$('.scroll-link').on('click', function(event) {
event.preventDefault();
var sectionID = $(this).attr("data-id");
scrollToID('#' + sectionID, 750);
});
// scroll to top action
$('.scroll-top').on('click', function(event) {
event.preventDefault();
$('html, body').animate({
scrollTop: 0
}, 'slow');
});
// mobile nav toggle
$('#nav-toggle').on('click', function(event) {
event.preventDefault();
$('#main-nav').toggleClass("open");
});
});
// scroll function
function scrollToID(id, speed) {
var offSet = 0;
var targetOffset = $(id).offset().top - offSet;
var mainNav = $('#main-nav');
$('html,body').animate({
scrollTop: targetOffset
}, speed);
if (mainNav.hasClass("open")) {
mainNav.css("height", "1px").removeClass("in").addClass("collapse");
mainNav.removeClass("open");
}
}
if (typeof console === "undefined") {
console = {
log: function() {}
};
}
@import url(https://fonts.googleapis.com/css?family=Poiret+One);
body {
position: relative;
}
html,
body,
#first,
#second,
#third,
#fourth {
height: 100%;
}
.navbar.navbar-default {
background-color: transparent;
background: transparent;
border-color: transparent;
padding-top: 30px;
color: white;
}
.navbar.navbar-default .navbar-brand {
color: white;
font-weight: bold;
font-size: 50px;
font-family: "Poiret One", sans-serif;
}
@media (min-width: 768px) {
.navbar.navbar-default .nav > li {
margin-left: 15px;
}
}
.navbar.navbar-default .nav > li > a {
color: white;
}
.navbar.navbar-default .nav > li.current-menu-item > a,
.navbar.navbar-default .nav > li.current-menu-ancestor > a,
.navbar.navbar-default .nav > li > a:hover,
.navbar.navbar-default .nav > li > a:focus {
background-color: rgba(255, 255, 255, 0);
color: pink;
}
.navbar.navbar-default .nav li.active a {
color: pink;
}
.navbar.navbar-default .glyphicon {
font-size: 20px;
}
.navbar.navbar-default .navbar-toggle .icon-bar {
display: block;
width: 22px;
height: 2px;
border-radius: 1px;
background-color: white;
}
@media (max-width: 767px) {
.navbar.navbar-default .navbar-toggle {
margin-top: 0px;
}
.navbar.navbar-default .nav > li {
text-align: right;
margin-right: 12.5px;
}
.navbar.navbar-default .navbar-collapse {
border: none;
box-shadow: none;
}
}
@media (max-width: 400px) {
.navbar.navbar-default .navbar-brand {
font-size: 35px;
}
}
#first {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/wallpaper-1948122_zpsjnr4n9n2.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#second {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/meteora-10_zps7j9jqszn.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#third {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/duesseldorf_wertig_zps1hk1ollh.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#fourth {
background: url(https://i.ytimg.com/vi/24i8G5a5d5Q/maxresdefault.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<body data-spy="scroll" data-target=".navbar" data-offset="50">
<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">PANAGIOTIS</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li><a class="scroll-link" data-id="first" href="#first"><span class="glyphicon glyphicon-home" id="ul-selected"></span></a>
</li>
<li><a class="scroll-link" data-id="second" href="#second"><span class="glyphicon glyphicon-user" id="ul-selected"></span></a>
</li>
<li><a class="scroll-link" data-id="third" href="#third"><span class="glyphicon glyphicon-th" id="ul-selected"></span></a>
</li>
<li><a class="scroll-link" data-id="fourth" href="#fourth"><span class="glyphicon glyphicon-envelope" id="ul-selected"></span></a>
</li>
</ul>
</div>
</div>
</nav>
<section id="first">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="second">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="third">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="fourth">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
</body>
我在使用 scrollspy 和平滑滚动时遇到了一些问题。请记住,我是这个东西的新手,我的 google-fu 很好。 :)
这个问题非常令人沮丧,过去几天我一直在尝试很多不同的解决方案,但 none 似乎有效。我在包含 4 个部分的单个页面上使用 bootstrap scrollspy 和平滑滚动。每个部分在导航栏中都有自己的字形图标,当滚动到该部分时,它应该变成粉红色。当我单击第二个图标时,它按预期工作。当我点击第 3 个时,第 2 个保持粉红色,即处于活动状态。当我点击第 4 个时,第 3 个变成白色,第 2 个保持粉红色。此外,手动滚动时,只有前两个图标会改变颜色。如果您自己看到这种行为,可能会更容易。
http://codepen.io/bohemian83/pen/wMbRZK
这是我的代码。
<html>
<body data-spy="scroll" data-offset="50" data-target=".navbar">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
// navigation click actions
$('.scroll-link').on('click', function(event){
event.preventDefault();
var sectionID = $(this).attr("data-id");
scrollToID('#' + sectionID, 750);
});
// scroll to top action
$('.scroll-top').on('click', function(event) {
event.preventDefault();
$('html, body').animate({scrollTop:0}, 'slow');
});
// mobile nav toggle
$('#nav-toggle').on('click', function (event) {
event.preventDefault();
$('#main-nav').toggleClass("open");
});
});
// scroll function
function scrollToID(id, speed){
var offSet = 0;
var targetOffset = $(id).offset().top - offSet;
var mainNav = $('#main-nav');
$('html,body').animate({scrollTop:targetOffset}, speed);
if (mainNav.hasClass("open")) {
mainNav.css("height", "1px").removeClass("in").addClass("collapse");
mainNav.removeClass("open");
}
}
if (typeof console === "undefined") {
console = {
log: function() { }
};
}
</script>
<style>
@import url(https://fonts.googleapis.com/css?family=Poiret+One);
.google {
font-family:"Poiret One",sans-serif;
}
.navbar .navbar-brand {
color: white !important;
}
.navbar .navbar-nav > li > a {
color: white;
padding: 20px 30px 10px 30px;
}
.navbar {
background-color: transparent;
background: transparent;
border-color: transparent;
padding-top: 30px;
color: white;
}
.navbar .nav > li.current-menu-item > a, .navbar .nav > li.current-menu-ancestor > a,
.navbar .nav > li > a:hover, .navbar .nav > li > a:focus {
background-color: rgba(255,255,255,0);
color: pink;
}
ul.nav li.active a {
color: pink;
}
.glyphicon {
font-size: 20px;
}
.navbar-toggle .icon-bar {
display: block;
width: 22px;
height: 2px;
border-radius: 1px;
background-color: white /* change this to any color you want! */;
}
#first {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/wallpaper-1948122_zpsjnr4n9n2.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#second {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/meteora-10_zps7j9jqszn.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#third {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/duesseldorf_wertig_zps1hk1ollh.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#fourth{
background: url(https://i.ytimg.com/vi/24i8G5a5d5Q/maxresdefault.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: 100% 100%;
width: 100%;
height: 90%;
min-height:90%;
}
html, body, #first, #second, #third, #fourth {
height: 100%;
}
#myName {
font-weight: bold;
font-size: 50px;
}
@media (max-width: 768px){
.navbar-nav li{
text-align: right;
}
}
html, #first, #second, #third, #fourth {
height: 100%;
}
body {
position: relative;
}
#myName {
font-weight: bold;
font-size: 50px;
}
@media (max-width: 768px){
.navbar-nav li{
text-align: right;
}
}
</style>
<nav role="navigation" class="navbar navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand google" href="#" style="margin-left:80px" id="myName">PANAGIOTIS</a>
</div>
<div class="navbar-collapse collapse pull-right" style="margin-right:50px">
<ul class="nav navbar-nav">
<li><a class="scroll-link" data-id="first" href="#first"><span class="glyphicon glyphicon-home" id="ul-selected"></span></a></li>
<li><a class="scroll-link" data-id="second" href="#second"><span class="glyphicon glyphicon-user" id="ul-selected"></span></a></li>
<li><a class="scroll-link" data-id="third" href="third"><span class="glyphicon glyphicon-th" id="ul-selected"></span></a></li>
<li><a class="scroll-link" data-id="fourth" href="fourth"><span class="glyphicon glyphicon-envelope" id="ul-selected"></span></a></li>
</ul>
</div>
</div>
</div>
</nav>
<section id="first">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="second">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="third">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="fourth">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
</body>
</html>
更新:您的代码有效,只是您没有在导航列表中正确设置锚点 ID。
href="third"
和href="fourth"
应该是href="#third"
和href="#fourth"
查看工作示例代码段。
$(document).ready(function() {
// navigation click actions
$('.scroll-link').on('click', function(event) {
event.preventDefault();
var sectionID = $(this).attr("data-id");
scrollToID('#' + sectionID, 750);
});
// scroll to top action
$('.scroll-top').on('click', function(event) {
event.preventDefault();
$('html, body').animate({
scrollTop: 0
}, 'slow');
});
// mobile nav toggle
$('#nav-toggle').on('click', function(event) {
event.preventDefault();
$('#main-nav').toggleClass("open");
});
});
// scroll function
function scrollToID(id, speed) {
var offSet = 0;
var targetOffset = $(id).offset().top - offSet;
var mainNav = $('#main-nav');
$('html,body').animate({
scrollTop: targetOffset
}, speed);
if (mainNav.hasClass("open")) {
mainNav.css("height", "1px").removeClass("in").addClass("collapse");
mainNav.removeClass("open");
}
}
if (typeof console === "undefined") {
console = {
log: function() {}
};
}
@import url(https://fonts.googleapis.com/css?family=Poiret+One);
body {
position: relative;
}
html,
body,
#first,
#second,
#third,
#fourth {
height: 100%;
}
.navbar.navbar-default {
background-color: transparent;
background: transparent;
border-color: transparent;
padding-top: 30px;
color: white;
}
.navbar.navbar-default .navbar-brand {
color: white;
font-weight: bold;
font-size: 50px;
font-family: "Poiret One", sans-serif;
}
@media (min-width: 768px) {
.navbar.navbar-default .nav > li {
margin-left: 15px;
}
}
.navbar.navbar-default .nav > li > a {
color: white;
}
.navbar.navbar-default .nav > li.current-menu-item > a,
.navbar.navbar-default .nav > li.current-menu-ancestor > a,
.navbar.navbar-default .nav > li > a:hover,
.navbar.navbar-default .nav > li > a:focus {
background-color: rgba(255, 255, 255, 0);
color: pink;
}
.navbar.navbar-default .nav li.active a {
color: pink;
}
.navbar.navbar-default .glyphicon {
font-size: 20px;
}
.navbar.navbar-default .navbar-toggle .icon-bar {
display: block;
width: 22px;
height: 2px;
border-radius: 1px;
background-color: white;
}
@media (max-width: 767px) {
.navbar.navbar-default .navbar-toggle {
margin-top: 0px;
}
.navbar.navbar-default .nav > li {
text-align: right;
margin-right: 12.5px;
}
.navbar.navbar-default .navbar-collapse {
border: none;
box-shadow: none;
}
}
@media (max-width: 400px) {
.navbar.navbar-default .navbar-brand {
font-size: 35px;
}
}
#first {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/wallpaper-1948122_zpsjnr4n9n2.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#second {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/meteora-10_zps7j9jqszn.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#third {
background: url(http://i1055.photobucket.com/albums/s503/pgrigorakis/duesseldorf_wertig_zps1hk1ollh.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
#fourth {
background: url(https://i.ytimg.com/vi/24i8G5a5d5Q/maxresdefault.jpg) no-repeat bottom left;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<body data-spy="scroll" data-target=".navbar" data-offset="50">
<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">PANAGIOTIS</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li><a class="scroll-link" data-id="first" href="#first"><span class="glyphicon glyphicon-home" id="ul-selected"></span></a>
</li>
<li><a class="scroll-link" data-id="second" href="#second"><span class="glyphicon glyphicon-user" id="ul-selected"></span></a>
</li>
<li><a class="scroll-link" data-id="third" href="#third"><span class="glyphicon glyphicon-th" id="ul-selected"></span></a>
</li>
<li><a class="scroll-link" data-id="fourth" href="#fourth"><span class="glyphicon glyphicon-envelope" id="ul-selected"></span></a>
</li>
</ul>
</div>
</div>
</nav>
<section id="first">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="second">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="third">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
<section id="fourth">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<h1></h1>
</div>
</div>
</div>
</section>
</body>