header {
    height: 60px;
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    max-width: 100%;
    z-index: 1000;
    margin-top: -1.25rem;
    border-bottom: 2px solid white;
}

header h1 {
    margin: 0;
}

nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}
nav ul li {
    margin: 0 10px;
    display: inline-block;
    border-radius: 20px;
}
nav ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 18px;
    padding: 1px 15px;
    display: block;
}
nav ul li a:hover {
    background-color: #555;
    border-radius: 20px;   
}
.active-link {
    background-color: #555; /* Cor de fundo quando o link está ativo */
}

@media (max-width: 480px) {
    header {
        max-width: 100%;
    }
}