body {
    font-family: Arial, sans-serif;
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
}
input, button {
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    box-sizing: border-box;
}
button {
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
}
button:hover {
    background-color: #45a049;
}
.error {
    color: red;
}
a {
    word-break: break-all;
}