Sil*_*fer 2 html css twitter-bootstrap
我尝试使用background-size: cover和将背景图像置于 div 中心background-size: contain，但它不起作用。我需要在 HTML 标签内显示背景图像并在 css 文件中使用背景大小，这是代码：
.container {
width: 200px;
height: 260px;
position: relative;
margin: 0 auto 40px;
margin-left: 20px;
display: inline-block;
}
.main{
border: 1px solid black;
background-color: #A6A6A6;
}
.card {
width: 100%;
height: 100%;
position: absolute;
border: 2px solid white;
}
.card div {
height: 100%;
width: 100%;
color: white;
text-align: center;
position: absolute;
}
.card .front {
background-repeat: no-repeat;
background-position: center center;
background-size: contain;
-webkit-background-size: contain;
-moz-background-size: contain;
-o-background-size: contain;
}<body style="background-image:url(https://s3.amazonaws.com/Syntaxxx/background-gold-bokeh.jpg);">
<div class="main">
<section class="container">
<div class="card">
<div class="front" style="background-image: url('http://www.mobygames.com/images/covers/l/403626-injustice-2-playstation-4-front-cover.png');">
</div>
<div class="back">1</div>
</div>
</section>
<section class="container">
<div class="card">
<div class="front" style="background-image: url('http://www.mobygames.com/images/covers/l/403651-the-surge-playstation-4-front-cover.jpg');">
</div>
<div class="back">2</div>
</div>
</section>
</div>
</body>你的.card .front风格background-repeat被赋予了太多的属性。
需要center center给予background-position
.card .front {
background-position: center center;
background-repeat: no-repeat;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
对于CSS和大多数其他维度，您使用X然后Y然后Z（除了Z索引之外没有Z）
背景大小将放大图像，直到整个 div 充满。
您要找的是background-size: contain. 这将在任何容器中显示完整图像。然后添加center center
.card .front {
background-image: url(https://s3.amazonaws.com/Syntaxxx/background-gold-bokeh.jpg);
background-repeat: no-repeat;
background-position: center center;
background-size: contain;
-webkit-background-size: contain;
-moz-background-size: contain;
-o-background-size: contain;
}