.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,123,255,0.4);
    transition: all 0.3s ease;
    z-index: 1000;
}