.booth{width:100%; max-width:1600px; margin:40px auto}
.booth img{width:100%}
.booth_subm{display:none}


/****** Mobile ******/
@media screen and (max-width:690px){
.booth{width:98%; margin:1%}
 .booth_sub{display:none}
 .booth_subm{display:block}
}