小编fen*_*n1x的帖子

* {
  margin: 0;
}

div {
  background-color: green;
  height: 900px;
  width: 50%;
  margin: auto;
  border-radius: 50px;
  overflow: hidden;
  padding: 20px;
  border: 4px solid red;
  box-sizing: border-box;
}

div:hover {
  box-shadow: 5px 5px 5px 1px blue;
}

@media screen and (max-width:600px) {
  div {
    background-color: aqua;
    color: red;
    width: 100%;
    height: 10%;
  }
  body {
    background-color: chocolate
  }
}

.divas {
  background-color: yellow;
  position: relative;
  margin-top: 20%;
  height: 300px;
  border-radius: 50%;
}

<div>This is text . This is text . …