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

body, html {
  font-size: 30px;
}

/* 你好 */
.windy, ul {
  color: #ff0;
  background-color: #f00;
}

h1 {
  width: 400px;
  height: 100px;
  font-size: 50px;
  background: yellow;
}

ul {
  width: 400px;
  height: 400px;
  background: #ff0;
  list-style: none;
  width: 200px;
  height: 300px;
  margin: 10px;
  border: 3px solid #00f;
}

ul li {
  padding: 10px;
}

ul li a {
  text-decoration: none;
  color: #00f;
  font-size: 40px;
  font-weight: bold;
}

ul li a:hover {
  color: #f00;
}

/*
    混合宏
    @mixin 允许定义一个可以再整个样式表复制的样式
    @include 可以将mixin混入到整个样式表中
*/
p {
  color: #00f;
}