现场演示：我的 HTML 文档

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Custom Select Box with CSS and jQuery</title>
<style>
	.select-wrapper{
		float: left;
		display: inline-block;
		border: 1px solid #d8d8d8;            
		background: url("/examples/images/dropdown.png") no-repeat right center;
		cursor: pointer;
	}
	.select-wrapper, .select-wrapper select{
		width: 200px;
		height: 26px;
		line-height: 26px;
	}
	.select-wrapper:hover{
		background: url("/examples/images/dropdown-hover.png") no-repeat right center;
		border-color: #239fdb;
	}
	.select-wrapper .holder{
		display: block;
		margin: 0 35px 0 5px;
		white-space: nowrap;            
		overflow: hidden;
		cursor: pointer;
		position: relative;
		z-index: -1;
	}
	.select-wrapper select{
		margin: 0;
		position: absolute;
		z-index: 2;            
		cursor: pointer;
		outline: none;
		opacity: 0;
	}
    
    /* Let's Beautify Our Form */
	form{
        margin: 20px;
    }
    input[type="submit"]{
        float: left;
        background: #d8d8d8;
        border: 1px solid #c4c4c4;
        margin-left: 10px;
        padding: 4px 10px;
        cursor: pointer;
        outline: none;
    }
    input[type="submit"]:hover{
        color: #fff;
        border-color: #1b7aa9;
        background-color: #239fdb;
    }
</style>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script>
    $(document).ready(function(){
        $(".custom-select").each(function(){
            $(this).wrap("<span class='select-wrapper'></span>");
            $(this).after("<span class='holder'></span>");
        });
        $(".custom-select").change(function(){
            var selectedOption = $(this).find(":selected").text();
            $(this).next(".holder").text(selectedOption);
        }).trigger('change');
    })
</script>
</head>
<body>
    <form action="/examples/faq/select-action.php" method="post">
        <p>What Is Your Favourite Time Pass:</p>        
        <select name="timepass" class="custom-select">
            <option>Select</option>
            <option>Driving</option>
            <option>Internet</option>
            <option>Movie</option>
            <option>Music</option>
            <option>Reading</option>
            <option>Sports</option>                
        </select>
        <input type="submit" value="Submit">
    </form>
</body>
</html>