.raster {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
  width: 100%;
}

.raster li {
  position: relative;
  float: left;
  overflow: hidden;
  width: 33.33%;
}

.raster li a,
.raster li a img {
  display: block;
  width: 100%;
}

.raster li a img {
  max-width: 100%;
  transform:scale(1);
  transition:all 0.8s;
}

.raster li:hover img {
  transform:scale(1.1);
}

.raster li a div {
  position: absolute;
  left: 1%;
  top: 1%;
  right: 1%;
  bottom: 1%;
  background: rgba(50,50,50,0.4);
  display: -webkit-flex;
  display: -moz-flex;
  display: -ms-flex;
  display: flex;
  -webkit-align-items: center;
  -moz-align-items: center;
  -ms-align-items: center;
  align-items: center;
  text-align: center;
  opacity: 0;
  cursor: default;
  transition:all 1s;
}

.raster li a:hover div {
  opacity: 1;
}

.raster li a div h3 {
  width: 100%;
  color: #fff;
  font-size: 1.4em;
  letter-spacing: 2px;
  padding: 0 10px;
}

@media screen and (max-width: 1000px) {
  .raster li {width: 50%}
}

@media screen and (max-width: 500px) {
  .raster li {width: 100%}
}