.iPad-simulator {
    position: absolute; /* top: 50%; margin-top: -444px; */
    left: 50%; margin-left: -572px; 
    width: 1024px; height: 768px; border-radius: 30px;
    padding: 0; border: 60px solid #333;
}

.iPad-simulator:after {
    content: ""; position: absolute; top: 364px; height: 40px;
    width: 40px; left: 1034px; background: #666; border-radius: 20px;
}