.mt20{margin-top    : 20px!important;}
.mr20{margin-right  : 20px!important;}
.mb20{margin-bottom : 20px!important;}
.ml20{margin-left   : 20px!important;}
.mt40{margin-top    : 40px!important;}
.mr40{margin-right  : 40px!important;}
.mb40{margin-bottom : 40px!important;}
.ml40{margin-left   : 40px!important;}
.w336{width:336px;!important; margin:auto;}

@media screen and (max-width:640px){
.w336{width:100%;!important; margin:auto;}
}