body {
    font-family: 'Ubuntu', sans-serif;
    margin: 0;
    padding: 0;
    transition: background-color 0.4s ease;
}

header {
    background-color: #333;
    padding: 20px;
    color: #fff;
}

header .spin {
    transition: all 20s ease-in-out;
    border-radius: 50%;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

nav {
    display: flex;
    align-items: center;
    justify-content: center;
}

nav a {
    color: #fff;
    text-decoration: none;
}

nav h1 {
    font-size: 30px;
}

main {
    padding: 20px;
}

footer {
    display: flex;
    align-items: center;
    justify-content: center;
}

main section {
    max-width: 1000px;
}