.back-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    background: white;
    color: #1e4fa8;
    padding: 8px 15px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 14px;
    font-weight: bold;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: 0.3s;
    z-index: 2;
}

.back-btn:hover {
    background: #1e4fa8;
    color: white;
}