<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>demo</title> </head> <body> <style type="text/css"> .div1{ width: 100px; height: 100px; border: 1px solid #000000;} .div2{ width:40px ; height: 40px; background-color: green;} </style> <div class="div1"> <div class="div2"> </div> </div> </body> </html>
如上的兩個div,實現div2在div1里面是居中顯示
一、方法一
利用margin,div1的寬減去div2的寬就是div2margin-left的數值:(100-40)/2=30
div1的高減去div2的高就是div2margin-top的數值:(100-40)/2=30
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>demo</title> </head> <body> <style type="text/css"> .div1{ width: 100px; height: 100px; border: 1px solid #000000;} .div2{ width:40px ; height: 40px; background-color: green;} .div22{ margin-left: 30px;margin-top: 30px; } </style> <div class="div1"> <div class="div2 div22"> </div> </div> </body> </html>
二、方法二
利用css的 position屬性,把div2相對於div1的top、left都設置為50%,然后再用margin-top設置為div2的高度的負一半拉回來,用marg-left設置為寬度的負一半拉回來,css如下設置
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>demo</title> </head> <body> <style type="text/css"> .div1{ width: 100px; height: 100px; border: 1px solid #000000;} .div2{ width:40px ; height: 40px; background-color: green;} .div11{ position: relative; } .div22{ position: absolute;top:50%;left: 50%;margin-top: -20px;margin-left: -20px; } </style> <div class="div1 div11"> <div class="div2 div22"> </div> </div> </body> </html>
三、方法三
還是用css的position屬性,如下的html
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>demo</title> </head> <body> <style type="text/css"> .div1{ width: 100px; height: 100px; border: 1px solid #000000;} .div2{ width:40px ; height: 40px; background-color: green;} .div11{ position: relative; } .div22{ position: absolute;margin:auto; top: 0;left: 0;right: 0;bottom: 0; } </style> <div class="div1 div11"> <div class="div2 div22"> </div> </div> </body> </html>
四、方法四
利用css3的新增屬性table-cell
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>demo</title> </head> <body> <style type="text/css"> .div1{ width: 100px; height: 100px; border: 1px solid #000000;} .div2{ width:40px ; height: 40px; background-color: green;} .div11{ display: table-cell;vertical-align: middle; } .div22{ margin: auto; } </style> <div class="div1 div11"> <div class="div2 div22"> </div> </div> </body> </html>
這個方法還有一個好處就是,div2的高度可以不固定,如下
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>demo</title> </head> <body> <style type="text/css"> .div1{ width: 100px; height: 100px; border: 1px solid #000000;} .div2{ width:40px ; background-color: green;} .div11{ display: table-cell;vertical-align: middle; } .div22{ margin: auto; } </style> <div class="div1 div11"> <div class="div2 div22"> div居中方法 </div> </div> </body> </html>