html {
   background-color: black;
    background-image: url('Images/teacup-bunnies.jpg');
 }
 .page-header {
   background-color: darkblue;
   color: #FFFFFF;
   padding: 20px;
   text-align:center;
 }
 .gallery {
   background-color: orange;
   padding: 30px;
   width: 700px;
   margin: 0 auto;
   margin-top: 30px;
   text-align:center;
 }
 .gallery img {
   height: 100px;
   border-width: 5px;
   border-color: #FFFFFF;
   border-style: solid;
   box-shadow: 3px 3px 5px 6px #000000;
   margin: 5px;
 }
   .main-menu a {
     background-color: orange;
     border-color: #00DD00;
     font-weight: bold;
     display: inline-block;
     padding: 5px 10px;
   }