header {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    padding: 0 40px;
    width: 100%;
    max-width: 1920px;
    height: 70px;
    background-color: #FFF;
    z-index: 50;
    color: #1E1E1E;
}

header a {
    display: block;
    width: 120px;
}

header a img {
    width: 100%;
}

@media screen and (max-width:990px) {
    header {
        padding: 0 20px;
        height: 50px;
    }
}