Step 1: Create an HTML file step 2: Insert a div inside the body. The code is as follows:

! DOCTYPE html> <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="Width = device - width, initial - scale = 1.0">
    <title>Document</title>
</head>
<body>
    <div></div>
</body>
</html>  
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Step 3: Set the border attributes for the div, set the width and height, and set the border style. Use the border-color attribute to accept four attributes to control the color of the four edges. The code is as follows:

<! 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>
        div{
            width: 100px;
            height: 100px;
           border-style: solid;
           border-color: red pink green yellow;  
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>
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