负边距不起作用

Question

我正在尝试获得负边距以允许我的徽标溢出页眉。

预期结果图片：

图像显示当前的错误结果：

我对 HTML 和 CSS 都很陌生，尽管我已经尽我最大的努力尝试使用这段代码并尝试在网上（包括本网站）寻找答案，以解决所有问题徒劳无功。所以这是我与这些部分相关的代码：

#logo {
  display: inline-block;
  margin: -30px 0px -100px 10px;
}
.hheader {
  background-color: #005073;
  background-image: -webkit-linear-gradient(rgba(0, 60, 80, .8) 0%, rgba(0, 80, 105, .8) 50%, rgba(0, 60, 80, .8) 100%);
  /* For Safari 5.1 to 6.0 */
  background-image: -o-linear-gradient(rgba(0, 60, 80, .8) 0%, rgba(0, 80, 105, .8) 50%, rgba(0, 60, 80, .8) 100%);
  /* For Opera 11.1 to 12.0 */
  background-image: -moz-linear-gradient(rgba(0, 60, 80, .8) 0%, rgba(0, 80, 105, .8) 50%, rgba(0, 60, 80, .8) 100%);
  /* For Firefox 3.6 to 15 */
  background-image: linear-gradient(rgba(0, 60, 80, .8) 0%, rgba(0, 80, 105, .8) 50%, rgba(0, 60, 80, .8) 100%);
  /* Standard syntax */
  box-shadow: inset 0px 0px 7px 2px rgba(0, 0, 0, 0.4);
  /* Standard syntax */
  -webkit-box-shadow: inset 0px 0px 7px 2px rgba(0, 0, 0, 0.4);
  -moz-box-shadow: inset 0px 0px 7px 2px rgba(0, 0, 0, 0.4);
  border-style: solid;
  border-width: 1px;
  border-color: black;
  margin-bottom: 2em;
  margin-top: 30px;
}

<div class="container">
  <div class="hheader">
    <a id="logo" href="/" title="Return to home">
      <img src="images/logo.png" alt="Density Art Logo">
    </a>
  </div>

如果需要，这里是两者的完整代码：

HTML

<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Density Art - Home</title>
<link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
<header>
    <div class="container">
        <div class="hheader">
            <a id="logo" href="/" title="Return to home">
            <img src="images/logo.png" alt="Density Art Logo">
            </a>
        </div>

        <div class="nav_menu">
            <nav>
                <ul>
                    <li><a href="#">Home</a></li>
                    <li><a href="#">Website Design</a></li>           
                    <li><a href="#">Art &amp; Poetry</a></li>  
                    <li><a href="#">Blog &amp; Other</a></li>
                    <li><a href="#">Music &amp; More</a></li>
                    <li><a href="#">Shop</a></li>  
                </ul>
            </nav>
        </div> <!-- end of container-->
    </div> <!-- end of navigator menu bar--> 
</header>


    <div id="content">
        <section id="leftcolumn">

            <h1>Home</h1>

            <h3>Who are we?</h3>

            <p>Density art is a small company local to Newcastle, Australia. We produce extremely quality websites, art and poetry alongside other projects that we have discoverdd is in absolutely high demand. You'll completely love all we have to offer so you may enjoy yourself when you will search through our products and buy them.</p>

            <p>Density art is a small company local to Newcastle, Australia. We produce extremely quality websites, art and poetry alongside other projects that we have discoverdd is in absolutely high demand. You'll completely love all we have to offer so you may enjoy yourself when you will search through our products and buy them.</p>

            <h3>What is our aim?</h3>

            <p>Density art is a small company local to Newcastle, Australia. We produce extremely quality websites, art and poetry alongside other projects that we have discoverdd is in absolutely high demand. You'll completely love all we have to offer so you may enjoy yourself when you will search through our products and buy them.</p>

            <p>Density art is a small company local to Newcastle, Australia. We produce extremely quality websites, art and poetry alongside other projects that we have discoverdd is in absolutely high demand. You'll completely love all we have to offer so you may enjoy yourself when you will search through our products and buy them.</p>

        </section> <!-- end of left column content-->

        <aside id="rightcolumn">

            <h2>Get Connected!</h2>
            <h5>Join our evergrowing community and become a part of Density Art</h5>

            <a href="http://www.facebook.com/" target="_blank"><img src="images/btns/fb.png" alt="Facebook"></a>
            <h4>Facebook</h4>

            <a href="http://www.instagram.com/" target="_blank"><img src="images/btns/ig.png" alt="InstaGram"></a>
            <h4>Instagram</h4>

            <a href="http://www.soundcloud.com/" target="_blank"><img src="images/btns/sc.png" alt="SoundCloud"></a>
            <h4>SoundCloud</h4>


            <a href="http://www.facebook.com/" target="_blank"><img src="images/btns/em.png" alt="Email"></a>
            <h4>Email</h4>


            <a href="http://www.facebook.com/" target="_blank"><img src="images/btns/ph.png" alt="Phone Call"></a>
            <h4>Phone Call</h4>


        </aside> <!--end of right column content-->

    </div> <!-- end of content form-->

<footer>
    <div id="footerbar">

        <p>Copyright &copy; informatrion copyright 2001 etc bnlah blah Copyright informatrion copyright 2001 etc bnlah blah Copyright informatrion copyright 2001 etc bnlah blah</p>

        <hr>

        <h6>Contact us</h6>
        <h6>Legal Terms</h6>
        <h6>Shopping Cart</h6>
        <h6>Facebook</h6>
        <h6>Instagram</h6>



    </div>


</footer>

</body>
</html>

CSS

html {
-webkit-font-smoothing: antialiased;
text-rendering: optimiszelegibility;   
}


body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size:14px;
line-height:20px;
color: ebe9e9; 
}

h1, h2 {
font-weight: 700;
margin:0;
line-height: 45px;    
}


h4, h6  {
font-weight: bold;
margin: 5px 0 5px 0;    
}

h1 {
font-size:48px;
}

h2 {
font-size:30px;
}

h3 {
font-size:24px;
font-weight: bold;
}

h4 {
font-size:20px;
line-height: 45px;
}

h5 {
font-size:16px;
font-weight: 600;
margin:0;
line-height: 45px; 
}

h6 {
font-size:12px;
line-height: 20px;
}

p {
margin: 0 0 10px 0;

}

nav ul li{
display: inline;
}

#logo {
display:inline-block;
margin: -30px 0px -100px 10px;
}

.hheader {
background-color: #005073;
background-image: -webkit-linear-gradient(rgba(0,60,80,.8) 0%,        rgba(0,80,105,.8) 50%, rgba(0,60,80,.8) 100%); /* For Safari 5.1 to 6.0 */
background-image: -o-linear-gradient(rgba(0,60,80,.8) 0%, rgba(0,80,105,.8)  50%, rgba(0,60,80,.8) 100%); /* For Opera 11.1 to 12.0 */
background-image: -moz-linear-gradient(rgba(0,60,80,.8) 0%, rgba(0,80,105,.8) 50%, rgba(0,60,80,.8) 100%); /* For Firefox 3.6 to 15 */
background-image: linear-gradient(rgba(0,60,80,.8) 0%, rgba(0,80,105,.8) 50%, rgba(0,60,80,.8) 100%); /* Standard syntax */
box-shadow: inset 0px 0px 7px 2px rgba(0,0,0,0.4); /* Standard syntax */
-webkit-box-shadow: inset 0px 0px 7px 2px rgba(0,0,0,0.4);
-moz-box-shadow: inset 0px 0px 7px 2px rgba(0,0,0,0.4);
border-style: solid;
border-width: 1px;
border-color: black;
margin-bottom: 2em;
margin-top: 30px;
}

.container {
width: 960px;
padding: 0 10px;
margin: 0 auto;
}

.nav_menu {
background-color: #005073;
background-image: -webkit-linear-gradient(rgba(0,0,0,.3), rgba(125,125,125,.3)); /* For Safari 5.1 to 6.0 */
background-image: -o-linear-gradient(rgba(0,0,0,.3), rgba(125,125,125,.3)); /* For Opera 11.1 to 12.0 */
background-image: -moz-linear-gradient(rgba(0,0,0,.3), rgba(125,125,125,.3)); /* For Firefox 3.6 to 15 */
background-image: linear-gradient(rgba(0,0,0,.3), rgba(125,125,125,.3)); /* Standard syntax */
-webkit-box-shadow: inset 0px 0px 2px 1px rgba(0,0,0,0.4); /* For Firefox 3.6 to 15 */
-moz-box-shadow: inset 0px 0px 2px 1px rgba(0,0,0,0.4);  /* For Firefox 3.6 to 15 */
box-shadow: inset 0px 0px 2px 1x rgba(0,0,0,0.4); /* Standard syntax */
border-style: solid;
border-width: 1px;
border-color: black;
max-height: 2em
}

如果任何好心的成员有所需的知识和能力来帮助我，请输入适合初学者的回复。

这是代码的 JSFiddle：https://jsfiddle.net/7hb9bd58/2/

Answer 1

.hhheader 高度没有变化，因为 #logo 的边距不影响 header 大小（取决于徽标的大小），您只移动 #logo，仅此而已。

为什么不直接设置 .hheader 元素的高度呢？像

height: 190px;

https://jsfiddle.net/7hb9bd58/4/

或，如果你出于某种原因不允许这样做，也许你可以只缩放徽标，它会溢出 header 集装箱

#logo {
    display:inline-block;
    transform: scale(1.3);
    margin-left:50px;
}

https://jsfiddle.net/7hb9bd58/5/

Answer 2

将徽标的位置设置为绝对位置

#logo {
    display:inline-block;
    position:absolute;
    margin: -30px 0px -100px 10px;
}

这将从流中删除图像，因此它不会再强制 .hheader 的高度包含它。作为补偿，请为 hheader 指定一个高度。（我用的是190px，你可以微调）

.hheader {
    height:190px;
/* rest of css */
}

https://jsfiddle.net/7hb9bd58/6/

Answer 3

在css中进行更改，根据需要更改高度

    .hheader {
      height:265px;
    }
 #logo {
    display: block;
    margin: 2px 0px -100px 10px;
    float: left;
}

负边距不起作用

Negative margin not working

html

css

margin