body{font-family:tahoma;background:#f2f2f2;display:flex;justify-content:center;align-items:center;height:100vh;}
.card{background:#fff;padding:30px;width:300px;border-radius:10px;box-shadow:0 0 10px #aaa;text-align:center;}
input,button{width:100%;padding:10px;margin:10px 0;border-radius:6px;}
button{background:#2196f3;border:0;color:#fff;font-size:16px;}