header {
    align-items: center;
    background: linear-gradient(90deg, rgb(10, 10, 50), rgb(30, 60, 120));
    border-radius: 50px;
    box-shadow: 2px 4px 8px rgba(0, 0, 0, 0.5);
    display: flex;
    height: 5vw;
    justify-content: space-around;
    margin: 2.5vw 2.5%;
    position: fixed;
    width: 95%;
    z-index: 99;
}

.header-link {
    color: white;
    text-decoration: none;
}

.header-link:hover {
    text-decoration: underline;
}

.under-header {
    height: 10vw;
}