body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #eef2f3;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
header, footer {
    background-color: #003366;
    color: white;
    text-align: center;
    padding: 10px 0;
}
main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}
.form-box {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px #aaa;
    width: 90%;
    max-width: 400px;
}
input, button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
}
button {
    background-color: #003366;
    color: white;
    border: none;
    cursor: pointer;
}
button:hover {
    background-color: #0055aa;
}