body {
    font-family: sans-serif;
    text-align: center;
    padding-top: 50px;
    background: #1a1a1a;
    color: white;
}

.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #1DA1F2;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 2s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}