body {
    font-family: Arial, sans-serif;
    background: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.container {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    text-align: center;
}
input {
    padding: 10px;
    margin-top: 15px;
    width: 80%;
}
button {
    margin-top: 10px;
    padding: 10px 20px;
    background: #000;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}
.error {
    color: red;
    margin-top: 10px;
}