body {
  background-color: #FAFCDE;
}

hr,
.page-header {
  border-color: #8C6F3A;
}

.main-container {
  perspective: 1000px;
  margin-bottom: 25px;
}

.memory-grid {
  display: inline-block;
  margin-top: 20px;
}
.memory-grid .symbol {
  float: left;
}

.symbol {
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  -webkit-transform: rotateX(-180deg);
  -moz-transform: rotateX(-180deg);
  -ms-transform: rotateX(-180deg);
  -o-transform: rotateX(-180deg);
  transform: rotateX(-180deg);
  background-color: #FAFCDE;
}
.symbol:after {
  content: '';
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #a00;
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/59627/square_card_back.jpg);
  background-size: cover;
}
.symbol, .symbol:after,
.symbol .icon {
  -webkit-transition: all 300ms linear;
  -moz-transition: all 300ms linear;
  transition: all 300ms linear;
}
.symbol .icon {
  display: inline-block;
  font-size: 50px;
  text-shadow: 0 1px 0 #3D799C;
  opacity: 0;
  color: #000;
  -webkit-transition-duration: 150ms;
  -moz-transition-duration: 150ms;
  transition-duration: 150ms;
  -webkit-transition-delay: 100ms;
  -moz-transition-delay: 100ms;
  transition-delay: 100ms;
}
.symbol.revealed {
  background-color: #85B5D0;
  outline: 1px solid #3D799C;
  cursor: default;
  -webkit-transform: rotateX(0deg);
  -moz-transform: rotateX(0deg);
  -ms-transform: rotateX(0deg);
  -o-transform: rotateX(0deg);
  transform: rotateX(0deg);
}
.symbol.revealed:after {
  opacity: 0;
}
.symbol.revealed .icon {
  text-shadow: 0 1px 0 #3D799C;
  opacity: 1;
}
.symbol.revealed.flashing {
  background-color: transparent;
  outline: 1px dashed #8C6F3A;
}
.symbol.revealed.flashing .icon {
  text-shadow: 0 1px 0 #8C6F3A;
}
.symbol.revealed.failed {
  background-color: #E38A7B;
  outline: 1px dashed #AB4432;
}
.symbol.revealed.failed .icon {
  text-shadow: 0 1px 0 #AB4432;
}

.mg-container.locked .symbol {
  cursor: default;
}