html {
      background-color: black; 
    background-image: url("http://media.giphy.com/media/CaleekPcVCBjO/giphy.gif");
    background-size: cover;
    background-attachment: fixed;}
    .page-title {
  font-family: "Chiller";
  font-size: 50px;
  text-shadow: 5px 5px 5px rgba(0,0,0,0.5);
}
.gallery img-section {
  background-color: darkgreen;
  text-align: center;
  padding: 30px;
  width: 700px;
  margin:0 auto;
  margin-top: 30px;
}
    .main-menu a {
    background-color: #00FF00;
    border-color: #00DD00;
    font-weight: bold;
    display: inline-block;
    padding: 5px 10px;
}
*:before,
	*:after {
		-webkit-box-sizing: border-box;
		-moz-box-sizing: border-box;
		box-sizing: border-box; 
}