In CSS, you can use the "font-size" and color attributes to set the font size and font color. You only need to add "{font-size: font size value; color: color value;}" to the font element. Just style it.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
How to set font size and font color in css:
1. Use the font-size attribute to set the font size
Demo code:
.demo1{font-size: 20px;}The example is as follows:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style type="text/css">
.demo1{font-size: 20px;}
.demo2{font-size: 50px;}
</style>
</head>
<body>
<p class="demo1">文字大小1</p>
<p class="demo2">文字大小2</p>
</body>
</html>Output result:

2. Use the color attribute to set the font color
Demo code:
.demo1{color: #FF0000;}Example:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style type="text/css">
.demo1{color: #FF0000;}
.demo2{color: #0E931C;}
</style>
</head>
<body>
<p class="demo1">文字颜色1</p>
<p class="demo2">文字颜色2</p>
</body>
</html>Output result:

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