Note: You can center the DIV horizontally and vertically.

Note: You can center the DIV horizontally and vertically.

Today I wrote a job for the Baidu front-end college spring class:Locate and center problemsSince I learned CSS for a long time, and I used to take notes, I forgot only one of the following methods, today, I summarized the following two simple ways to center the DIV horizontally and vertically. =. =

First:

HTML code:

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>

CSS:

 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 }

 

Method 1: use negative margin, provided that the size is known. Best compatibility.

Sets the horizontal and vertical offset of 50% of the parent element,
Then, the child element is moved to the left to half the size based on the actual length.

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

Method 2: Use the CSS3 transform with an indefinite width and support IE9 +

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