.newtop {margin: 0 auto;width:1092px;text-align:center;}
.newtop ul {list-style: none;padding:0;margin:0}
.newtop li {float: left;padding:0;margin:0}

.tu {border:1px solid #fff;text-align:center;width:180px;height:240px;}
A:hover .tu, A:active .tu {border:1px solid #81B3DD;}

@media screen and (max-width: 1000px) {
body { min-width:768px;}
.newtop {width: 760px;}
}

@media screen and (max-width: 788px) {
body { min-width:620px;}
.newtop {width: 610px;}
}

@media screen and (max-width: 620px) {
body { min-width:500px;}
.newtop {width: 490px;}
}

@media screen and (max-width: 520px) {
body { min-width:300px;}
.newtop {width: 300px;}
}