body {
    font-family: Arial, sans-serif;
    text-align: center;
    background: #0D0D2B;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.container {
    max-width: 600px;
}
h1 {
    font-size: 2.5em;
}
.loader {
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top: 5px solid #fff;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}