body {
    margin:0;
    height:100vh;
    display:flex;
    align-items:center;
    justify-content:center;
    background:#111827;
    color:white;
    font-family:Arial, sans-serif;
}

.container {
    text-align:center;
    background:#1f2937;
    padding:50px;
    border-radius:20px;
}

h1 {
    color:#22c55e;
}