html, body { 
    overflow: hidden; 
    background: #000; 
    padding: 0px; margin: 0px; 
    width: 100%; height: 100%; 
}

.fullScreen { 
    height: 100%; 
}

.logo {
   position: absolute;
   top: 50%;
   left: 50%;
   width: 540px;
   height: 170px;
   margin-top: -85px; /* Half the height */
   margin-left: -270px; /* Half the width */
}