body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#model-buttons {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    background: rgba(0, 0, 0, 0.5);
    padding: 10px;
    border-radius: 5px;
}

.model-button {
    background: #4CAF50;
    border: none;
    color: white;
    padding: 10px 20px;
    margin: 0 5px;
    border-radius: 3px;
    cursor: pointer;
    transition: background 0.3s;
}

.model-button:hover {
    background: #45a049;
}

.model-button.active {
    background: #2196F3;
}