前端解决因为浮动，父级边框塌陷问题

为父类添加一个伪类：after

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
head>
<style>
    #father {
        border: 1px red solid;
    }

    /*父类添加一个伪类：after*/
    #father:after {
        content: '';
        display: block;
        clear: both;
    }

    .d1 {
        background: blue;
        width: 100px;
        height: 100px;
        float: left;
        display: inline-block;
    }

    .d2 {
        background: blueviolet;
        width: 100px;
        height: 150px;
        float: left;
        display: inline-block;
    }

    .d3 {
        background: brown;
        width: 100px;
        height: 200px;
        float: right;
        display: inline-block;
    }

style>
<body>
<div id="father">
    <div class="d1">div>
    <div class="d2">div>
    <div class="d3">div>
div>

body>
html>　　
    #father:after {
        content: '';
        display: block;
        clear: both;
    }
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