body {
    font-family: Arial;
    margin: 0;
    background: #f5f7fa;
}

nav {
    background: #4CAF50;
    color: white;
    padding: 15px;
    text-align: center;
}

.container {
    padding: 20px;
}

input, button {
    padding: 10px;
    margin: 5px;
    width: 100%;
    max-width: 300px;
}

button {
    background: #4CAF50;
    color: white;
    border: none;
}

@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
}