body {
    font-family: sans-serif;
    background: #f0f0f0;
    padding: 40px;
}

.container {
    background: white;
    padding: 20px;
    max-width: 400px;
    margin: auto;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input {
    width: 100%;
    padding: 8px;
    margin: 6px 0;
    box-sizing: border-box;
}

button {
    padding: 10px;
    width: 100%;
    background: #1976d2;
    color: white;
    border: none;
    border-radius: 4px;
}

.error {
    color: red;
}