body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background-color: #0077cc;
    color: white;
    padding: 20px;
    text-align: center;
}
main {
    padding: 20px;
}
section {
    margin-bottom: 20px;
}
input, button {
    display: block;
    margin: 5px 0;
    padding: 10px;
    width: 100%;
    max-width: 300px;
}
button {
    background-color: #0077cc;
    color: white;
    border: none;
    cursor: pointer;
}
button:hover {
    background-color: #005fa3;
}