Hyde number of photos

I tried to hide the number of photos from the album with this rule, but it doesn't seem to be working. Could you please let me know if there's something I'm missing?

.ba-album-items > .ba-caption >.ba-caption-content > p {
margin: 15px;
display: none !important;

Similarly, I'd like to change the default color of the back button when I hover over it in all galleries (there are a lot of them, and doing it one by one would be time-consuming).
Thanx you a lot

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