body {
    background: linear-gradient(179deg, #ecf0ff 0%, #a2a5c5 100%);
    height: 100vh;
    margin: 0;
    font-family: 'Arial', sans-serif;
}
.error-container {
    text-align: center;
    color: #fff;
}
.error-code {
    font-size: 10rem;
    font-weight: bold;
    text-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}
.btn-custom {
    display: inline-block;
    margin-top: 1rem;
    background: #ff6a00;
    color: #fff;
    border-radius: 30px;
    padding: 10px 25px;
    transition: all 0.3s ease;
    text-decoration: none;
}
.btn-custom:hover {
    background: #e65c00;
    transform: translateY(-3px);
}