div#sub-nav {
    position: relative;
}

div#sub-nav::before {
    content: '';
    position: absolute;
    top: -12px;
    left: 0;
    right: 0;
    height: 32px;
    background-image: url('https://cdn.tebex.io/store/1624775/templates/229223/assets/222298aee2072e76737fdea483b46dd227e2b0e4.png?updated=0421e4a001a513911e41ebbc081733d8c83b547b608f2c4c917cf607734fc2ea');
    background-repeat: space; /* Creates even gaps between hollies */
    background-size: auto 100%;
    background-position: center;
    z-index: 1000;
    pointer-events: none;
    animation: holly-shimmer 2s ease-in-out infinite;
}

@keyframes holly-shimmer {
    0%, 100% { 
        opacity: 1;
        filter: brightness(1.25);
    }
    50% { 
        opacity: 0.92;
        filter: brightness(0.75);
    }
}