@media only screen and (max-width:768px){
    .header { background:transparent;}
    .header .logo { height: 60px;}
    .header .logo img { height: 35px;
    margin-left: 10px;}
    .ir1_box { margin-top: 68px; margin-top: 0;}
    
    .header .head { padding: 8px 0 0;}
    .g-nav2 { padding-top: 60px;}
    .ban { margin-top: 0;}
}