CSS3 :root 选择器 设置HTML文档的背景色:
/* :Root root element of the document
html element
general styles
css variables
*/
INDEX.HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CSS Tutorial</title>
<link rel="stylesheet" href="styles.css">
</head>
<body >
<h1>i'm heading</h1>
<p class="absolute">
Lorem ipsum dolor sit amet consectetur adipisicing elit. Ullam,
tempore? Nobis nemo pariatur, harum veniam accusamus similique voluptatibus
rem alias.
</p>
<p class="responsive">
Lorem ipsum dolor, sit amet consectetur adipisicing elit. Aliquid,
velit, voluptates architecto autem facere optio animi in quis doloribus
id provident enim blanditiis omnis ipsam eos sed nisi praesentium repellendus.
</p>
</body>
</html>
CSS:
/* :Root root element of the document
html element
general styles
css variables
*/
:root {
background: yellowgreen;
font-size: 110%;
}
h1 {
font-size: 3rem;
}
.absolute {
font-size: 20px;
}
.responsive {
font-size: 1.5rem;
}
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