.container {
  width: 100%;
  margin-top: 10%;
}

/* http://jsfiddle.net/AntonTrollback/nqQc7/ */

.item {
  position: relative;
  overflow: hidden;
  width: 250px;
  height: 250px;
  display: inline-block;
  margin: 0;
  box-sizing: border-box;
  
  border-radius: 5px;
  border-color: slategray;
  border-style: ridge;
  color: #fff;
  background: #00529b;
  background-size: cover;
  text-decoration: none;
  text-align: center;
  line-height: 50px;
  font-size: 18px;
  font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif
}

.item:after {
  content: "";
  position: absolute;
  top: -110%;
  left: -210%;
  width: 100%;
  height: 200%;
  opacity: 0;
  transform: rotate(30deg);
  
  background: rgba(255, 255, 255, 0.13);
  background: linear-gradient(
    to right, 
    rgba(255, 255, 255, 0.13) 0%,
    rgba(255, 255, 255, 0.13) 77%,
    rgba(255, 255, 255, 0.5) 92%,
    rgba(255, 255, 255, 0.0) 100%
  );
}

/* Hover state - trigger effect */

.item:hover:after {
  opacity: 0.25;
  top: -30%;
  left: 210%;
  transition-property: left, top, opacity;
  transition-duration: 1.2s, 0.7s, 0.15s;
  transition-timing-function: ease;
}

/* Active state */

.item:active:after {
  opacity: 0;
}

.item:hover {
  color: #fff;
}