.mobile{
    display: block
}
.mobile-show{
    display: none;
}
a {
    text-decoration: none;
}
/*正常的未被访问过的链接*/
a:link {
    text-decoration: none;
}
/*已经访问过的链接*/
a:visited {
    text-decoration: none;
}
/*鼠标划过(停留)的链接*/
a:hover {
    text-decoration: none;
}
/* 正在点击的链接*/
a:active {
    text-decoration: none;
}
@media screen and (max-width: 600px) {
    .mobile{
        display: none;
    }
    .mobile-show{
        display: block;
    }
}