* {
  box-sizing: boder-box;
}

body {
  margin: 0;
}

#main {
  position: relative;
  z-index: 20;
  background: #fff;
  -webkit-transition: -webkit-transform .6s ease;
  transition: -webkit-transform .6s ease;
  transition: transform .6s ease;
  transition: transform .6s ease, -webkit-transform .6s ease;
}
@media (min-width: 640px) {
  #main {
    padding: 1em;
  }
}

.fake-section {
  background: #eee;
  height: 300px;
}

.tiles-a {
  width: 100%;
  position: relative;
  overflow: hidden;
}
.tiles-a ul {
  margin: 0;
  padding: 0;
}
.tiles-a li {
  list-style: none;
}
@media (min-width: 640px) {
  .tiles-a li {
    float: left;
    width: 33.33%;
  }
}
.tiles-a a {
  margin: 0.25em;
  display: block;
  background: #222;
  padding-top: 73%;
  height: 0;
}

#page-mask{
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  background-color: #DCDCDC; 
  z-index: -1;
}

#aside {
	position: fixed;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
	display:block;
	width:70%;
	margin:auto;
	background: #eee;
	z-index: -1;
}
#aside img {
 	display:block;
	width:100%;
	margin:auto;
	vertical-align: top;

}
#aside .wrapper {
  padding: 1em;
}
#aside .close {
  width: 30px;
  display: block;
  position: absolute;
  top: 1em;
  right: 1em;
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: 50%;
}

.show-detail {
  overflow: hidden;
}
.show-detail #main {
  -webkit-transform: translateX(-100%);
          transform: translateX(-100%);
}

.visually-hidden {
  position: absolute;
  overflow: hidden;
  clip: rect(0 0 0 0);
  height: 1px;
  width: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
}