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;
}
.button {
  float:left;
  width:30%;
  margin-left:2.5%;
  height:6em;
  background-image: linear-gradient(rgba(120,128,135,0), rgba(120,128,135,1));
  color:white;
  border-bottom:3px solid white;
}