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console 命令行工具 X clear 

                    

                        
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console

            
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .grid-container {
            display: grid;
            /*一行3个元素*/
            grid-template-columns: repeat(3, 1fr);
            /*行和列的间距均为15; grid-row-gap:设置行之间的间距; grid-column-gap:设置列之间的间距*/
            grid-gap: 15px;
        }
        .grid-item {
            background-color: #ccc;
            padding: 20px;
            height: 100px;
            background: url('https://img1.baidu.com/it/u=728576857,3157099301&fm=253&fmt=auto&app=138&f=JPEG?w=500&h=313');
            background-size: cover;
        }
    </style>
</head>
<body>
    <!--网格布局, 一行三列, 每一块宽高比例为2:9-->
    <div id="app">
        <div class="grid-container">
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
            <div class="grid-item"></div>
        </div>
    </div>
</body>
</html>