nav { padding:15px 0; }
nav img { max-height:40px; }

#s2 ul { width:100%; list-style:none;background-color:#2a2a2a; }
#s2 img { max-width: 100%; }
#s2 ul li { float:left; width:50%; cursor:pointer; }
#s2 ul li:first-child { text-align:right; }
#s2 ul li:last-child { text-align:left; }
#s2 label {
  position: absolute;
  top:-4%;
  left:0;
  display: inline-block;
  width:50%;
  z-index:22;
  -webkit-transform:  translateY(4%) !important;
  -moz-transform:  translateY(4%) !important;
  -ms-transform:  translateY(4%) !important;
  -o-transform:  translateY(4%) !important;
  transform:  translateY(4%) !important;

}
#nav_tab_2 { display: none; }
#article2,
#article2_2 {
  text-align:center;
}
.tab_bg { 
  width:100%;
  background-color:#2a2a2a;
}
#s2 { background-color: #e1e5ea; }
#s3 { background-color: #ffffff; }
#s4 { background-color: #c9edff; padding-bottom:20px }
#s4 a { display: inline-block; margin:20px; }
#s4 a img { max-width: 80%; }

.left { float:left; }
.right { float:right; }

#s2 ul:after,
section:before,
.container:after {
  display: table;
  content: "";
}
#s2 ul:after,
section:before,
.container:after {
  clear:both;
}