How can using fixed pixel sizes in CSS affect the responsiveness of a website built with PHP?

Using fixed pixel sizes in CSS can make a website less responsive because elements will not adjust properly to different screen sizes. To make a website more responsive, it's recommended to use relative units like percentages or ems in CSS. This allows elements to scale appropriately based on the viewport size. 

<!DOCTYPE html>
<html>
<head>
    <style>
        .container {
            width: 80%; /* Use percentage for responsiveness */
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Welcome to our website</h1>
        <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    </div>
</body>
</html>

Keywords

PHP CSS fixed pixel sizes responsiveness website

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