*{margin: 0;padding: 0;}
li{list-style: none;}
img{max-width: 100%;}
input,button{outline: none;border: none;}
.clearfix::after{display: block;visibility: hidden;content: '';clear: both;}
.fl{float: left;}
.fr{float: right;}
.container{width: 1200px; margin: 0 auto;}
a{color: #333;text-decoration: none;}
a:hover{color: red;}