header {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 120px;
    width: 100%;
    background: rgb(22, 22, 22) ;
    border-bottom: 2px solid #494747;
    color:white;
    font-size:35px;
}

nav ul {
    display: flex;
    gap: 40px;
    list-style: none;
    margin: 0;
    padding: 0;
}

nav ul li a {
    text-decoration: none;
    transition: 0.3s;
}

nav ul li a:hover {
    color: #b6b6b6;
    transform: scale(1.05);
}

nav ul li a:visited {
    color: white; 
}

header {
    position: sticky;
    top: 0;
    z-index: 1000;
}