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關於百分比寬高div居中並垂直居中問題

nbsp text bottom bubuko 定位 doctype ati ext div

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>關於div居中</title>
</head>
<style type
="text/css"> html, body { height: 100%; } .div1 { width: 60%; height: 40%; border: 1px solid #000000; } .div2 { width: 40%; height: 45%; background-color: green; } </style> <body> <div class="div1"> <
div class="div2"> </div> </div> </body> </html>

技術分享圖片

一、絕對定位

  

.div1 {
     position: relative;
 }

.div2 {
     margin: auto;
     position: absolute;
     top: 0;
     bottom: 0;
     left: 0;
     right: 0;
 }

技術分享圖片

二、translate

  

.div2 {
     position: relative;
     top: 50%;
     left: 50%;
     transform: translate(-50%, -50%);
 }

三、flex

  

.div1 {
    display: flex;     justify-content: center;     align-items: center;
    }

  

關於百分比寬高div居中並垂直居中問題