Customize background button color

I have this code but it doesn’t work.

.shared-counts-wrap.style-buttons .shared-counts-button {
  background-color: #f15025 !important;
}

.shared-counts-wrap.style-buttons .shared-counts-button:hover {
  background-color: #c44126 !important;
}

Could you help me figure it out?
Thank you so much.

The page I need help with: [log in to see the link]