.heading_w_bg    {
    background: rgba(0, 0, 0, 0.60);
    padding: 15px 40% 15px 30px;
    border-bottom: solid 5px #5fb3e1 !important;;
}

div#rna_section .av-section-color-overlay, div#cells_section .av-section-color-overlay, div#dna_section .av-section-color-overlay, div#transformative_section .av-section-color-overlay {
    opacity: 0 !important;
}