CSS 边框悬停效果
Border hover effect with CSS
我试图复制边框悬停效果,但我不明白为什么我需要使用 ::before 和 ::after 来实现这种 Css 效果。
这是我想用css复制内容的页面示例(我想复制边框效果):
http://77.238.26.244:81/confimi/pagina-di-test/
这是我试图复制 css 的主页:
http://77.238.26.244:81/confimi/
第一行是"example",下一行是我的尝试
这是我编写的代码:
round {
background-image: url('http://77.238.26.244:81/confimi/wp-content/uploads/2016/08/a.jpg');
background-repeat: no-repeat;
background-attachment: fixed;
background-size: cover;
height: 100%;
}
.layer {
background-color: rgba(18, 29, 47, 0.96);
background-repeat: repeat;
width: 100%;
height: 100%;
text-align: center;
padding: 200px 20px 200px 20px;
}
.div-diviso {
width: 17%;
margin: 10px;
display: inline-block;
position: relative;
box-sizing: border-box;
}
.div-diviso img {
width: 100%;
position: relative;
}
.div-diviso .overlay {
width: 100%;
height: 100%;
position: absolute;
box-sizing: border-box;
top: 0;
left: 0;
background-color: rgba(0, 0, 0, 0.6);
opacity: 0;
transform: scale(0.1);
-webkit-transform: scale(0.1);
-moz-transform: scale(0.1);
-ms-transform: scale(0.1);
-o-transform: scale(0.1);
transition: all 0.5s ease-in-out;
-webkit-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
visibility: hidden;
}
.div-diviso:hover .overlay {
opacity: 1;
transform: scale(1);
-webkit-transform: scale(1);
-moz-transform: scale(1);
-ms-transform: scale(1);
-o-transform: scale(1);
visibility: visible;
border: 3px solid #ffffff;
transform: border scale3d(0, 1, 1);
}
@media (min-width: 768px) and (max-width: 980px) {
.layer {
text-align: center;
}
.div-diviso {
width: 47%;
margin: 10px;
}
}
@media (max-width: 767px) {
.layer {
text-align: center;
}
.div-diviso {
width: 98%;
margin: 5px;
}
}
<div class="background">
<div class="layer">
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/SILVIA-FAIT-2017_980.jpg">
<div class="overlay">
</div>
</div>
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/CLAUDIO-ZAMPARELLI-2017_980.jpg">
<div class="overlay">
</div>
</div>
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/ROBERTA-MAGNANI-2017_980.jpg">
<div class="overlay">
</div>
</div>
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/BARBARA-VANNI-2017_980.jpg">
<div class="overlay">
</div>
</div>
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/SANDRO-CAMPANI-2017_980.jpg">
<div class="overlay">
</div>
</div>
</dvi>
</div>
您无法在 css 中原生地从中间开始设置动画边框。它们将从 div
的起点自动过渡(如果您想使用 transform: rotate(180deg)
,则从另一端自动过渡)。因此,使用 ::before
& ::after
元素。
此外,transform: border scale3d(0, 1, 1);
无效,因为 border
不是适用于 transform
的 CSS3 属性。
如果你不想使用伪元素,那么你可以在叠加层上使用一个延迟出现的边框。但是它不会从中间开始动画。
将您的 css 修改为:
.div-diviso:hover .overlay {
opacity: 1;
transform: scale(1);
-webkit-transform: scale(1);
-moz-transform: scale(1);
-ms-transform: scale(1);
-o-transform: scale(1);
visibility: visible;
border: 3px solid #ffffff;
transition: border 0.75s;
}
编辑
如果您确实想使用伪选择器,请应用以下内容css:
.div-diviso:hover .overlay:before, .div-diviso:hover .overlay:after {
height: 100%;
top: 0;
width: 100%;
left: 0;
-webkit-transition-delay: 0.2s;
transition-delay: 0.2s;
}
.div-diviso .overlay:before, .div-diviso .overlay:after {
content: '';
-webkit-transition: all 0.3s ease-in-out;
-o-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
z-index: 9;
}
.div-diviso .overlay:after {
content: '';
width: 0;
height: 100%;
position: absolute;
top: 0;
left: 50%;
border-top: 3px solid #20bed0;
border-bottom: 3px solid #20bed0;
}
.div-diviso .overlay:before {
width: 100%;
height: 0;
position: absolute;
top: 50%;
left: 0;
border-left: 3px solid #20bed0;
border-right: 3px solid #20bed0;
}
我试图复制边框悬停效果,但我不明白为什么我需要使用 ::before 和 ::after 来实现这种 Css 效果。
这是我想用css复制内容的页面示例(我想复制边框效果):
http://77.238.26.244:81/confimi/pagina-di-test/
这是我试图复制 css 的主页:
http://77.238.26.244:81/confimi/
第一行是"example",下一行是我的尝试
这是我编写的代码:
round {
background-image: url('http://77.238.26.244:81/confimi/wp-content/uploads/2016/08/a.jpg');
background-repeat: no-repeat;
background-attachment: fixed;
background-size: cover;
height: 100%;
}
.layer {
background-color: rgba(18, 29, 47, 0.96);
background-repeat: repeat;
width: 100%;
height: 100%;
text-align: center;
padding: 200px 20px 200px 20px;
}
.div-diviso {
width: 17%;
margin: 10px;
display: inline-block;
position: relative;
box-sizing: border-box;
}
.div-diviso img {
width: 100%;
position: relative;
}
.div-diviso .overlay {
width: 100%;
height: 100%;
position: absolute;
box-sizing: border-box;
top: 0;
left: 0;
background-color: rgba(0, 0, 0, 0.6);
opacity: 0;
transform: scale(0.1);
-webkit-transform: scale(0.1);
-moz-transform: scale(0.1);
-ms-transform: scale(0.1);
-o-transform: scale(0.1);
transition: all 0.5s ease-in-out;
-webkit-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
visibility: hidden;
}
.div-diviso:hover .overlay {
opacity: 1;
transform: scale(1);
-webkit-transform: scale(1);
-moz-transform: scale(1);
-ms-transform: scale(1);
-o-transform: scale(1);
visibility: visible;
border: 3px solid #ffffff;
transform: border scale3d(0, 1, 1);
}
@media (min-width: 768px) and (max-width: 980px) {
.layer {
text-align: center;
}
.div-diviso {
width: 47%;
margin: 10px;
}
}
@media (max-width: 767px) {
.layer {
text-align: center;
}
.div-diviso {
width: 98%;
margin: 5px;
}
}
<div class="background">
<div class="layer">
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/SILVIA-FAIT-2017_980.jpg">
<div class="overlay">
</div>
</div>
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/CLAUDIO-ZAMPARELLI-2017_980.jpg">
<div class="overlay">
</div>
</div>
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/ROBERTA-MAGNANI-2017_980.jpg">
<div class="overlay">
</div>
</div>
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/BARBARA-VANNI-2017_980.jpg">
<div class="overlay">
</div>
</div>
<div class="div-diviso">
<img src="http://77.238.26.244:81/confimi/wp-content/uploads/2017/02/SANDRO-CAMPANI-2017_980.jpg">
<div class="overlay">
</div>
</div>
</dvi>
</div>
您无法在 css 中原生地从中间开始设置动画边框。它们将从 div
的起点自动过渡(如果您想使用 transform: rotate(180deg)
,则从另一端自动过渡)。因此,使用 ::before
& ::after
元素。
此外,transform: border scale3d(0, 1, 1);
无效,因为 border
不是适用于 transform
的 CSS3 属性。
如果你不想使用伪元素,那么你可以在叠加层上使用一个延迟出现的边框。但是它不会从中间开始动画。
将您的 css 修改为:
.div-diviso:hover .overlay {
opacity: 1;
transform: scale(1);
-webkit-transform: scale(1);
-moz-transform: scale(1);
-ms-transform: scale(1);
-o-transform: scale(1);
visibility: visible;
border: 3px solid #ffffff;
transition: border 0.75s;
}
编辑
如果您确实想使用伪选择器,请应用以下内容css:
.div-diviso:hover .overlay:before, .div-diviso:hover .overlay:after {
height: 100%;
top: 0;
width: 100%;
left: 0;
-webkit-transition-delay: 0.2s;
transition-delay: 0.2s;
}
.div-diviso .overlay:before, .div-diviso .overlay:after {
content: '';
-webkit-transition: all 0.3s ease-in-out;
-o-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
z-index: 9;
}
.div-diviso .overlay:after {
content: '';
width: 0;
height: 100%;
position: absolute;
top: 0;
left: 50%;
border-top: 3px solid #20bed0;
border-bottom: 3px solid #20bed0;
}
.div-diviso .overlay:before {
width: 100%;
height: 0;
position: absolute;
top: 50%;
left: 0;
border-left: 3px solid #20bed0;
border-right: 3px solid #20bed0;
}