Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
.button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

.button1 {width: 250px;}
.button2 {width: 50%;}
.button3 {
    padding-left: 0;
    padding-right: 0;
    width: 100%;
}
</style>
</head>
<body>

<h2>Button Width</h2>
<p>Use the width property to change the width of the button:</p>
<p><strong>Tip:</strong> Use pixels if you want to set a fixed width and use percent for responsive buttons (e.g. 50% of its parent element).</p>

<button class="button button1">250px</button><br>
<button class="button button2">50%</button><br>
<button class="button button3">100%</button>

</body>
</html>