body {
  background-color: rgb(13, 34, 115);
  background-image: url("../img/Border_Squares.png");
  background-repeat: no-repeat;
  width: 99%;
  height: 99%;
}
a {
  text-decoration: none;
}
img.start {
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-top: 65px;
  opacity: 0.15;
}
img.start:hover {
  margin-top: 63px;
  opacity: 0.95;
  box-shadow: -5px 5px 5px #000000;
  border: 2px solid black;
}