*{
    margin: 0;
    padding: 0;
}
ul{
    list-style: none;
}
a{
    text-decoration: none;
}
.w1200{
    width: 1200px;
    margin: auto;
}
@media screen and (max-width:768px) {
    .w1200{
        width: 100%;
        padding: 0 2%;
        box-sizing: border-box;
    }
}