#mainImage {
  height: 400px;
  width: 700px;
  background-image: url(../images/home-page2.jpg);
  background-color: #FFF;
  background-repeat:no-repeat;
  background-position:center; 
  margin: 0 auto;
  margin-top: 20px;
  margin-bottom: 5px;
  border: 1px solid #ccc;
}