Post-loop carousel slider title size

Hello,
I’m having a problem with the post loop carousel slider.
I tried to resize the title size with the following Custom CSS which did not do anything.

.vantage-carousel-wrapper .vantage-carousel li.carousel-entry h3 {
font-size: 26px;
text-align: center;
font-weight: normal;
}

Could you please advice how to edit the title size?
Thanks in advance,
– Sanna