.fullscreen-btn {
    position: fixed;
    top: 40px;
    left: 20px;
    z-index: 1000;
    background-color: rgb(98, 126, 110);
    border: none;
    color: white;
    font-size: 20px;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.fullscreen-btn:hover {
    background-color: rgb(78, 106, 90);
    transform: scale(1.05);
}

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

.fullscreen-btn i {
    pointer-events: none;
}