#scrollTopBtn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 100;
    width: 50px;
    height: 50px;
    background-color: #5D6BA7;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    
    display: flex;
    align-items: center;
    justify-content: center;
}
#scrollTopBtn:hover {
    background-color: #555;
}