Sticky Navigation Bar for Ishimoto Template - CSS Help

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/* Fixed Header - Desktop */
header#header {
    position: fixed !important;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
}
div#pageWrapper {
    margin-top: 100px;
}
/* Fixed Header - Mobile */
div#mobileMenuLink {
    position: fixed;
    left: 0;
    right: 0;
    z-index: 999;
}