使用linear-gradient()CSS函数将线性渐变设置为背景图像。您可以尝试运行以下代码以在CSS中实现linear-gradient()函数
<!DOCTYPE html>
<html>
<head>
<style>
#demo {
height: 200px;
background: linear-gradient(green, orange, maroon);
}
</style>
</head>
<body>
<p>Setting background as linear gradient.</p>
<div id = "demo"></div>
</body>
</html>