body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: Arial, sans-serif;
}

header {
    background-color: blue;
    color: white;
    padding: 1rem;
    text-align: center;
}

main {
    flex: 1;
    padding: 2rem;
}

footer {
    background-color: green;
    color: white;
    padding: 1rem;
    text-align: center;
}

button {
    background-color: red;
    color: white;
    border: 1px solid blueviolet;
    border-radius: 10px;
    padding: 0.5rem 1rem;
    cursor: pointer;
}