方法一 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>未知宽高元素水平垂直居中</title> </head> <style> .parent1{ display: table; height:300px; width: 300px; background-color: #FD0C70; } .parent1 .child{ display: table-cell; vertical-align: middle; text-align: center; color: #fff; font-size: 16px; } </style> <body> <div class="parent1"> <div class="child">hello world-1</div> </div> </body> </html> 方法二:
思路:使用一个空标签span设置他的vertical-align基准线为中间,并且让他为inline-block,宽度为0 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>未知宽高元素水平垂直居中</title> </head> <style> .parent2{ height:300px; width: 300px; text-align: center; background: #FD0C70; } .parent2 span{ display: inline-block;; width: 0; height: 100%; vertical-align: middle; zoom: 1;/*BFC*/ *display: inline; } .parent2 .child{ display: inline-block; color: #fff; zoom: 1;/*BFC*/ *display: inline; } </style> <body> <div class="parent1"> <div class="child">hello world-1</div> </div> <div class="parent2"> <span></span> <div class="child">hello world-2</div> </div> </body> </html>
方法三
思路:子元素绝对定位,距离顶部 50%,左边50%,然后使用css3 transform:translate(-50%; -50%)
方法四: <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>未知宽高元素水平垂直居中</title> </head> <style> .parent4{ display: flex; justify-content: center; align-items: center; width: 300px; height:300px; background: #FD0C70; } .parent4 .child{ color:#fff; } </style> <body>div> <div class="parent4"> <div class="child">hello world-4</div> </div> </body> </html> |