محرر ويب أونلاين

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<!DOCTYPE html>
<html>
    <head>
        <style>
.mix {
    border-style: solid double;
}
        </style>
    </head>
    <body>
        <h2>CSS border-style</h2>
        <p class="mix">
            Solid border on top and bottom.<br>
            Dotted border on left and right.
        </p>
    </body>
</html>