body { margin: 0; background: #000; color: #fff; font-family: monospace; }

#mainpg {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
height: 100vh;
gap: 12px;
}

#mainpg.hidden { display: none; }

#switchview {
display: none;
width: 100vw;
height: 100vh;
object-fit: contain;
}

#switchview.active { display: block; }