面试题:垂直居中？用padding内填充方式垂直居中给父元素添加overflow:hidden;给子元素添加margin

垂直居中

用padding内填充方式垂直居中

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>1.垂直居中</title>
    <!--用padding内填充方式进行垂直居中-->
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .father{
            width: 500px;
            height: 200px;
            background: #000;
            margin: auto;
            padding:150px 0;/*(父高-子高)/2*/
        }
        .son{
            width: 200px;
            height: 200px;
            background: red;
        }
    </style>
</head>
<body>
<div class="father">
    <div class="son"></div>
</div>
</body>
</html>

给父元素添加overflow:hidden;给子元素添加margin-top;(margin-top传递问题)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>3.垂直居中</title>
    <!--给父元素添加overflow:hidden;给子元素添加margin-top(margin-top传递问题)-->
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .father{
            width: 500px;
            height: 500px;
            margin: auto;
            background: green;
            overflow: hidden;
        }
        .son{
            width: 200px;
            height: 200px;
            background: pink;
            margin-top: 150px;/*margin-top传递问题,(父高-子高)/2就是margin-top的值*/
        }
    </style>
</head>
<body>
<div class="father">
    <div class="son"></div>
</div>
</body>
</html>

用弹性布局,实现垂直居中

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>2.垂直居中</title>
    <style>
        /*用弹性布局实现垂直居中*/
        *{
            margin: 0;
            padding: 0;
        }
        .father{
            width: 500px;
            height: 500px;
            background: blue;
            margin: auto;
            display: flex;
            align-items: center;
        }
        .son{
            width: 200px;
            height: 200px;
            background: green;
        }
    </style>
</head>
<body>
<div class="father">
    <div class="son"></div>
</div>
</body>
</html>

给父元素添加display:table-cell;vertical-align:middle;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>4.垂直居中</title>
    <!--给父元素添加display:table-cell;vertical-align:middle-->
    <style>
     *{
         padding: 0;
         margin: 0;
     }
     .father{
         width: 500px;
         height: 500px;
         background: purple;
         display: table-cell;/*处理垂直居中*/
         vertical-align: middle;/*处理垂直居中*/
     }
     .son{
         width: 200px;
         height: 200px;
         background: goldenrod;
     }
    </style>
</head>
<body>
<div class="father">
    <div class="son"></div>
</div>
</body>
</html>

给父元素 position:relative;给子元素 position: absolute;top:50%; margin-top:-高度/2

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>5.垂直居中</title>
    <!--给父元素 position:relative;给子元素 position: absolute;top:50%; margin-top:-高度/2-->
    <style>
     *{
         margin: 0;
         padding: 0;
     }
     .father{
         width: 500px;
         height: 500px;
         background: #000;
         margin: auto;
         position: relative;
     }
     .son{
         width: 200px;
         height: 200px;
         background: blue;
         position: absolute;
         top: 50%;
         margin-top: -100px;
     }
    </style>
</head>
<body>
<div class="father">
    <div class="son"></div>
</div>
</body>
</html>

给父元素添加了position:relative;给子元素添加position:absolute;top:50%;transform:translateY(-高度/2)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>6.垂直居中</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .father{
            width: 500px;
            height: 500px;
            background: #000;
            margin: auto;
            position: relative;
        }
        .son{
            width: 200px;
            height: 200px;
            background: yellowgreen;
            position: absolute;
            top: 50%;
            transform: translateY(-100px);
        }
    </style>
</head>
<body>
<div class="father">
    <div class="son"></div>
</div>
</body>
</html>