footer a {
    color: #ffcc00;
    text-decoration: none;
    position: relative;
    transition: color 0.3s ease;
}

footer a::after {
    content: "";
    position: absolute;
    bottom: -3px;
    left: 0;
    height: 2px;
    width: 0;
    background-color: #ffcc00;
    transition: width 0.3s ease;
}

footer a:hover {
    color: #e6b800;
}

footer a:hover::after {
    width: 100%;
}

header, footer {
    padding: 20px 10px;
}

header, footer {
    background-color: black;
    color: white;
    text-align: center;
    padding: 25px;
}