.half-page-image {
   opacity: 1;
  -webkit-transition: background-color 2s ease-out;
  -moz-transition: background-color 2s ease-out;
  -o-transition: background-color 2s ease-out;
  border: 0px;
  transition: background-color 2s ease-out;
   }

   .half-page-image:hover {
      opacity: 0.5;
      }

.half-page-image {
  width: 70%;
  height: auto;
      display: block;
    margin-left: auto;
    margin-right: auto;
	margin: 0 auto;
	border: 0px;
  
}