* {-webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box;}
.clear::after{clear:both;visibility:hidden;display:block;content:""}
.after::after{clear:both;visibility:hidden;display:block;content:""}
.before::before{clear:both;visibility:hidden;display:block;content:""}
body::after{clear:both;visibility:hidden;display:block;content:""}
.none_scroll{overflow:hidden;}
#invisible{display:none;}