body {
    font-family: Arial, sans-serif;
    background:#020617;
    color:#fff;
    display:flex;
    justify-content:center;
    align-items:center;
    height:100vh;
}
.container {
    background:#0f172a;
    padding:30px;
    border-radius:12px;
    width:360px;
    text-align:center;
}
input,button {
    width:100%;
    padding:10px;
    margin-top:10px;
}