body {
  background: #000;
  margin: 0;
  padding: 0;
  }

#nav {
  width: 190px;
  margin-left: 30px;
  margin-top: 370px;
  padding: 0;
  float: left;
  }

a img {
  border: 0;
  margin: 2px;
  padding: 2px;
  }

#squares a:hover img {
  background: #fff;
  }

#squares a {
  position:absolute;
  }