html,body,ul,p,input,h1,h2,h3,h4,h5,li,dl,dt,dd{
    margin: 0;
    padding: 0;
}
ul{
    list-style: none;
}

a{
    text-decoration: none;
    color: #333;
}
input{
    /* 清除外轮廓 */
    outline: none;
}