* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  li {
    list-style: none;
  }
  em,
  i {
    font-style: normal;
  }
  a {
    text-decoration: none;
    color: #333;
  }
  img {
    width: 100%;
    vertical-align: middle;
  }
  input {
    padding: 0;
    border: none;
    outline: none;
    color: #333;
  }
  button {
    cursor: pointer;
  }
  /* 清除浮动 */
  .clearfix:before,
  .clearfix:after {
    content: '';
    display: table;
  }
  .clearfix:after {
    clear: both;
  }
  .clearfix {
    *zoom: 1;
  }