header {
    flex: 0 0 auto;
    background-color: #333;
    width: 100%;
    z-index: 200;
}

header nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin: 0;
    padding: 0.25rem;
    gap: 0.25rem;
}



nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    display: inline;
}

nav ul li a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
}

nav ul li a:hover {
    background-color: #575757;
    border-radius: 5px;
}

footer {
    flex: 0 0 auto;
}