.header.head1 .logo, .header.scroll .logo { padding: .08rem 0;}
.header.head1 .logo img, .header.scroll .logo img { max-height: .7rem;}
.logo img {  transition: all .2s;} 
.picture3 > li { width: 20% ;}
@media screen and (max-width: 768px) {
.picture3 > li { width: 50%;}
}