How to style a dropdown using CSS?

There are many ways to design <select> dropdown menu using CSS. Dropdown menu is mainly used to select an element from the list of elements.

Example 1: This example contains the dropdown CSS property to display the appearance of dropdown box. It contains the CSS property to set the dropdown background color, text-color, font-size, cursor pointer etc.

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<!DOCTYPE html>
<html>
    <head>
        <style>
            select {
                appearance: none;
                outline: 0;
                background: green;
                background-image: none;
                width: 100%;
                height: 100%;
                color: black;
                cursor: pointer;
                border:1px solid black;
                border-radius:3px;
            }
            .select {
                position: relative;
                display: block;
                width: 15em;
                height: 2em;
                line-height: 3;
                overflow: hidden;
                border-radius: .25em;
                padding-bottom:10px;
                  
            }
            h1 {
                color:green;
            }
        </style>
    </head>
    <body>
        <center>
        <h1>GeeksforGeeks</h1>
        <div class="select">
            <select name="slct" id="slct">
                <option>Computer Science Subjects</option>
                <option value="1">Operating System</option>
                <option value="2">Computer Networks</option>
                <option value="3">Data Structure</option>
                <option value="4">Algorithm</option>
                <option value="5">C programming</option>
                <option value="6">JAVA</option>
            </select>
        </div>
        </center>
    </body>
</html>                                

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Example 2: This example contains some CSS property to display the appearance of dropdown box where -webkit-, -moz- and -ms- used for browser support. 











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<!DOCTYPE html> 


<html> 


    <head> 


        <style> 


            h1 { 


                color:green; 


            } 


            select { 


                -webkit-appearance: none; 


                -moz-appearance: none; 


                -ms-appearance: none; 


                appearance: none; 


                outline: 0; 


                background: green; 


                background-image: none; 


                border:1px solid black; 


            } 


            .select { 


                position: relative; 


                display: block; 


                width: 20em; 


                height: 3em; 


                line-height: 3; 


                background: #2C3E50; 


                overflow: hidden; 


                border-radius: .25em; 


            } 


            select { 


                width: 100%; 


                height: 100%; 


                margin: 0; 


                padding: 0 0 0 .5em; 


                color: #fff; 


                cursor: pointer; 


            } 


            select::-ms-expand { 


                display: none; 


            }  


            .select::after { 


                content: '\25BC'; 


                position: absolute; 


                top: 0; 


                right: 0; 


                bottom: 0; 


                padding: 0 1em; 


                background: #34495E; 


                pointer-events: none; 


            } 


            .select:hover::after { 


                color: #F39C12; 


            } 


              


            <!-- For different browsers -->


            .select::after { 


                -webkit-transition: .25s all ease; 


                -o-transition: .25s all ease; 


                transition: .25s all ease; 


            } 


        </style> 


    </head> 


    <body> 


        <center> 


        <h1>GeeksforGeeks</h1> 


        <div class="select"> 


            <select name="slct" id="slct"> 


                <option>Computer Science Subjects</option> 


                <option value="1">Operating System</option> 


                <option value="2">Computer Networks</option> 


                <option value="3">Data Structure</option> 


                <option value="4">Algorithm</option> 


                <option value="5">C programming</option> 


                <option value="6">JAVA</option> 


            </select> 


        </div> 


        </center> 


    </body> 


</html>                              



















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Output:




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