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Bài 10: Position relative - absolute trong CSS RUN

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <style>
            .relative{
                height: 300px;
                width: 300px;
                position: relative;
                margin: 100px auto;
                background: blue;
            }

.absolute{
                position: absolute;
                height: 40px;
                width: 40px;
            }

.red{
                top: 200px;
                left: 100px;
                background: red;
            }

.yellow{
                top: 100px;
                left: 200px;
                background: yellow;
            }

.white{
                top: 150px;
                left: 250px;
                background: white;
            }
        </style>
    </head>
    <body>
        <div class="relative">
            <div class="absolute red"></div>
            <div class="absolute yellow"></div>
            <div class="absolute white"></div>
        </div>
    </body>
</html>