محرر ويب أونلاين

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<!DOCTYPE html>
<html>
    <head>
        <style>
.flex-container {
    display: flex;
    flex-direction: row;
    background-color: dodgerblue;
}
​
.flex-container > div {
    background-color: #f1f1f1;
    padding: 15px 20px;
    margin: 10px;
    font-size: 18px;
}
        </style>
    </head>
    <body>
        <h1>CSS flex-basis: number</h1>
        <p>This property specify the preferable size to use if available.</p>
        <div class="flex-container">
            <div style="flex-basis: 150px">1</div>
            <div>2</div>
            <div>3</div>
        </div>
        <p>Resize the window to notice how elements size can be changed in need.</p>
    </body>
</html>