用户:Sam0324/Sandbox.css

.body{
 width:100%;
 height:100vh;
 background-color:black;
}
.data{
 margin:0 auto;
 width:90%;
 border:5px solid white;
}
.chapter{
  background-image: linear-gradient(rgba(128,128,128,0), rgba(128,128,128,1));
  background-color: black;
}