【笔记】让DIV水平垂直居中的两种方法_html/css_WEB-ITnose

1 <div class="wrap">2     <div class="main first">3         <div id="left" class="yuan"></div>4         <div id="right" class="yuan"></div>5     </div>6 </div>

 1 .main{ 2     width: 400px; 3     height: 200px; 4     overflow: hidden; 5     background-color: #ccc; 6     position: absolute; 7 } 8 .yuan{ 9     width: 100px;10     height: 100px;11     background-color:yellow;12     border-radius: 50%;13     -moz-border-radius: 50%;14     -webkit-border-radius: 50%;15     position: absolute;16 }17 #left{18     top: -50px;19     left: -50px;20 }21 #right{22     bottom: -50px;23     right: -50px;24 }

设定水平和垂直偏移父元素的50%，<br />再根据实际长度将子元素上左挪回一半大小

1 .first{2     top: 50%;3     left: 50%;4     margin-left: -200px;5     margin-top: -100px;6 }

1 .second{2     left: 50%;3     top: 50%;4     transform: translate(-50%,-50%);5 }