body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f4f8;
    font-family: 'Arial', sans-serif;
    color: #333;
    position: relative;
    overflow: hidden;
}
.ghost-background {
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: url('../raw/ghost.png') no-repeat center;
    background-size: 300px;
    opacity: 0.2;
    width: 400px;
    height: 400px;
    animation: float 6s ease-in-out infinite;
    z-index: 0;
}
.error-container {
    text-align: center;
    z-index: 1;
    position: relative;
    padding: 20px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.error-container h1 {
    font-size: 2.5rem;
    color: #555;
    margin-bottom: 20px;
}

.error-container p {
    font-size: 1.2rem;
    color: #777;
    margin-bottom: 20px;
}

.error-container .back-button {
    text-decoration: none;
    color: white;
    background-color: #ce63ff;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 1rem;
    transition: background 0.3s ease;
}

.error-container .back-button:hover {
    background-color: #e042d3;
}

@keyframes float {
    0%, 100% {
        transform: translate(-50%, -50%);
    }
    50% {
        transform: translate(-50%, calc(-50% - 20px));
    }
}