body {
	background-color:black;
	margin: 50px;
}
body::after {
  content: "";
  background: url(foot.jpg);
  opacity: 0.3;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  position: absolute;
  z-index: -1;   
}

h1 {
	color: white;
    text-align: center;
    margin: 50px;
}
.gallery {
    margin: 15px 0;
}