CSS渐变背景把页面拆分成条状

想尝试做一个125度的渐变效果但是效果把页面拆成了一条条每一条里都是125度的
代码如下：

<!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>Homebage</title>
    <link rel="stylesheet" href="./style.css">
</head>
<body>
    <div class = "a">
        <h1>Hello World</h1>
    </div>

</body>
</html>

*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body{
    
    background-image: linear-gradient(125deg,#00CACA,#5CADAD,blue,green,#B15BFF);
    
    background-size: 100% 100%;
}
![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/192526814456197.png "#left")

给body给个高度就行了。或者加一个底层div

<body>
  <div class = "main">
    <div class = "a">
        <h1>Hello World</h1>
    </div>
  </div> 
</body>


.main{    
        background-image: linear-gradient(125deg,#00CACA,#5CADAD,blue,green,#B15BFF);
        background-size: 100% 100%;
        position: absolute;
        width: 100%;
        bottom: 0;
        top: 0;
    }