.gallery1 {
	margin:0 auto;
	text-align:center;
}

ul.img-list {list-style-type: none;
  margin: 0;padding: 0;
  text-align: center;
}

ul.img-list li {display: inline-block;
  height: 235px;
  margin: 0 1em 1em 0;
  position: relative;
  width: 240px;
}

span.text-content {background: rgba(0,0,0,0.5);
  color: white;font-size: 16px;
  cursor: pointer;
  display: table;
  height: 235px;
  left: 0;
  position: absolute;
  top: 0;
  width: 240px;
  opacity: 0;
  -webkit-transition: opacity 500ms;
  -moz-transition: opacity 500ms;
  -o-transition: opacity 500ms;
  transition: opacity 500ms;
}

span.text-content span {
  display: table-cell;
  text-align: center;
  vertical-align: top;
}

ul.img-list li:hover span.text-content {
  opacity: 1;
}