body { font-family: Arial, sans-serif; background: #f5f5f5; margin:0; padding:0; }
.container { max-width: 400px; margin: 50px auto; padding: 20px; background: #fff; border-radius: 10px; box-shadow: 0 0 10px #ccc; }
input, button { width: 100%; padding: 10px; margin: 5px 0; border-radius: 5px; border:1px solid #ccc; }
button { background: #28a745; color: #fff; border:none; cursor:pointer; }
button:hover { background: #218838; }
h1 { text-align:center; }