body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
    text-align: center;
    align-items: center;
    justify-content: center;
}

.frame {
    background-color: black;
    color: white;
    border: 5px solid #333;
    padding: 10px;
    display: inline-block;
}

header {
    background-color: green;
    color: black;
    text-align: center;
    padding: 1em;
}

section {
    margin: 20px;
}

ul {
    list-style-type: none;
    padding: 0;
}

footer {
    text-align: center;
    padding: 1em;
    background-color: green;
    color: black;
}