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css
/
css1.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
</head>
<style>
    #mydiv::before{
        content: "";
        display: block;
        height: 10px;
        width: 10px;
        background-color: aquamarine;
    }

    #mydiv:hover {
        background-color: bisque;
    }
</style>

<body>
    <div id="mydiv">
        <button id="mybutton">点击</button>
        <button id="mybutton2">点击</button>
        <button id="mybutton3">点击</button>
    </div>
</body>

</html>