@media screen and (min-width: 300px){
    .IconDow{
        max-width: 45px;
        max-height: 45px;
    }
    .Boxtd{
        max-width: 10px;
    }
    .IconDow2{
        max-width: 18px;
        max-height: 17px;
    }
}

@media screen and (min-width: 768px) {
    .IconDow{
        max-width: 700px;
        max-height: 70px;
    }
    .Boxtd{
        max-width: 10px;
    }
    .IconDow2{
        max-width: 30px;
        max-height: 30px;
    }
}

@media screen and (min-width: 1200px) {
    .IconDow{
        max-width: 800px;
        max-height: 800px;
    }
    .Boxtd{
        max-width: 10px;
    }
    .IconDow2{
        max-width: 30px;
        max-height: 30px;
    }
}