@charset "UTF-8";
* {
  margin: 0;
  padding: 0;
  list-style: none;
  text-decoration: none;
  box-sizing: border-box;
}

/*
    多行注释
    .sass .scss
    sass格式会省略花括号和分号 所以常用scss存储
*/
.box {
  width: 200px;
  height: 200px;
  font-size: 30px;
  border: 3px solid red;
}

h1 {
  color: blue;
}

h2 {
  color: blue;
}