body {
  margin: 0;
  padding: 0;
  width: 100%;
}

.story {
  width: 70%;
  margin: 0 auto;
}

.story h1 {
  text-align: center;
  font-size: 36px;
  text-transform: uppercase;
}

.story h1::selection {
  color: yellow;
  background: tomato;
}

.story p {
  font-size: 20px;
  line-height: 1;
  /* 超出容器自动换行 */
  word-wrap: break-word;
}

.story p::selection {
  color: #fff;
  background: #262626;
}