h3.accordion-section-title a {
    color: #fff !important;
    background: #000 !important;
    border: #000 !important;
}

h3.accordion-section-title.premium-details {
    background: #5FAAB1 !important;
    color: #fff !important;
}
h3.accordion-section-title.premium-details::after {
    display: none !important;
}

• [F] admin.css
  Delete
• [F] customizer.css
  Delete