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120. 4 cool ways to center any items using CSS

程序员文章站 2022-05-02 09:37:01
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1. Text Align

  文字居中，不过也只是针对文字。

 1） test文字会横向居中

2） 对于Div ，会居中其中文字

<!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>Document</title>
    <style>
        body{
          margin: 0;
          padding: 0;
          background: #eaeaea;
        }

        .container{
            width: 1000px;
            height: 800px;
            background: white;
            margin: 0 auto;
            text-align: center;
        }

        .box{
            width:300px;
            height:160px;
            background: yellowgreen;
        }
    </style>
</head>
<body>
    <div class="container">
        test
        <div class="box">test</div>
    </div>
</body>
</html>

2. Margin Auto： 

  margin: 0 auto;

 ç­‰ä»·äºŽmargin-left:auto; margin-right:auto;

上述方法是左右对齐，对于上下对齐，需要计算上下margin，并且设置父元素为overflow:hidden

overflow：详解  overflow：解决外边距坍塌

<!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>Document</title>
    <style>
            body {
                margin: 0;
                padding: 0;
                background: #eaeaea;
            }
            
            .container {
                width: 1000px;
                height: 600px;
                background: white;
                overflow: hidden;
                
            }
            
            .box {
                width: 200px;
                height: 200px;
                background:deepskyblue;
                margin:200px auto;
            }
    </style>
</head>
<body>
    <div class="container">
        <div class="box" ></div>
    </div>
   
</body>
</html>

3. Display Flex：justify-content 主轴对齐方式 align-items:侧轴对齐方式

<!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>Document</title>
    <style>
        body{
            margin:0;
            padding:0;
            background: #eaeaea;
        }
        .box1{
            height:200px;
            width:200px;
            background: deepskyblue;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .box2{
            height:100px;
            width:100px;
            background: yellowgreen;
        }
    </style>
</head>
<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>
</html>

4. Position Absolute

position:relative用于父元素， position:absolute用于子元素， 子元素会依照父层的边界进行定位的, 不然position:absolute 会逐层向上寻找设置了position:relative的元素边界, 直到body元素.

<!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>Document</title>
    <style>
        .box1 {
            height: 200px;
            width: 200px;
            background: deepskyblue;
            position: relative;
        }

        .box2 {
            height: 100px;
            width: 100px;
            background: yellowgreen;
            position: absolute;
            top:50%;
            left:50%;
            transform: translate(-50%, -50%);
        }
    </style>
</head>

<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>

</html>

 

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