flex布局子元素间距问题

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Documenttitle>
    <style>
        .father{
            display: flex;
            flex-wrap: wrap;
            gap: 20px; /* 左右间距和上下间距都是20px */
        }
        .son{
            width: 100px;
            height: 100px;
            background-color: red;
        }

        .father2{
            display: flex;
            flex-wrap: wrap;
            gap: 50px 20px; /* 上下间距50px,左右间距20px */
        }
        .son2{
            width: 100px;
            height: 100px;
            background-color: red;
        }
    style>
head>
<body>
    <div class="father">
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
        <div class="son">div>
    div>
    <hr>
    <div class="father2">
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
        <div class="son2">div>
    div>
body>
html>

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