css gradient

"en">

    "UTF-8">
    "X-UA-Compatible" content="IE=edge">
    "viewport" content="width=device-width, initial-scale=1.0">
    



    

    
class="box bg-gradient">
    

 更多参考：CSS3中的 Background:linear-gradient()用法详解 - 简书 (jianshu.com)