CSS gap 属性是用来设置网格行与列之间的间隙（gutters），该属性是 row-gap 和 column-gap 的简写形式。 developer.mozilla.org/zh-CN/docs/…

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            background: red;
            display: flex;
            flex-wrap: wrap;
            padding: 10px;
            row-gap: 10px;
        }
        .inner-box {
            background: green;
            width: 100px;
            height: 100px;
            border: 1px solid yellow;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
        <div class="inner-box"></div>
    </div>
</body>
</html>

企业微信截图_64beab5d-14b3-4871-b48f-bd73252d3b26.png

row-gap

.box {
            background: red;
            display: flex;
            flex-wrap: wrap;
            padding: 10px;
            row-gap: 10px;
        }

企业微信截图_8139d811-88bd-48b8-a43b-c39b36b69fec.png

column-gap

        .box {
            background: red;
            display: flex;
            flex-wrap: wrap;
            padding: 10px;
            row-gap: 10px;
            column-gap: 10px;
        }

企业微信截图_e74aabb7-f8fa-437f-b45a-caade4b745cc.png

css: gap解决flex-wrap换行，两行之间无间隙

row-gap

column-gap