body {
    background: #000;
}

.logo img {
    
   position: absolute;
   top: 50%;
   left: 50%;
   width: 650px;
   height: 650px;
   margin-top: -325px; /* Half the height */
   margin-left: -325px; /* Half the width */
}

.top {
    height: 50px;
    background: #000;
    display: block;
}

.footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  background: #000;
  color: white;
  text-align: center;
}