body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: Arial, sans-serif;
}

#panorama {
    width: 100vw;
    height: 100vh;
}

.chs {
    height: 16px;
    width: 16px;
    background: transparent url(ico.png) no-repeat center center;
    opacity: 0.5; /* 50% transparent */
    transition: opacity 0.3s ease-in-out; /* Animation with ease-in-out */
}

.chs:hover {
    opacity: 1; /* 100% visible on hover */
}

#nav-controls {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
    padding: 20px;
    pointer-events: none;
    z-index: 1000;
}

.nav-btn {
    background-color: rgba(255, 255, 255, 0.25);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
    font-size: 16px;
    font-weight: bold;
    border-radius: 50%;
    cursor: pointer;
    pointer-events: auto;
    transition: all 0.3s ease;
    width: 41px;
    height: 41px;
}

.nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.35);
    border-color: rgba(255, 255, 255, 0.6);
    transform: scale(1.05);
}

.nav-btn:active {
    transform: scale(0.95);
}