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父元素:
.banner {
background-image: url(../images/header_desktop.png);
background-color:black;
background-repeat: no-repeat;
background-position: center center;
height: 420px;
/* 父元素加入 */
position: relative;
}
子元素:
.banner_box {
width: 400px;
height:150px;
background-color: rgba(0, 0, 0, 0.3);
text-align:center;
color:#fff;
/* 子元素加入 */
position: absolute;
top:0;
bottom:0;
left:0;
right:0;
margin:auto;
}
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