Change text size within CARD IMAGE LAYOUT on mobile view only (AVENUE)

Hello,

I'm trying to increase the size of the text within the CARD IMAGE layout in Avenue template for mobile. Currently, the description text after the header within the image card is a larger font. I would like to make it smaller - in relation to the header (as it is when viewed on desktop). The URL: https://www.onebreath.eu/mbsr

So in the example URL, I would like the greek text to be a smaller size than the text "Mindfulness Based Stress Reduction" when viewed on mobile.

Thank you!!!

past this code in custom css box

@media only screen and (max-width: 640px) {
.sqs-block-image .design-layout-poster .image-subtitle p {
   font-family: Open Sans;
   font-weight: 600;
   font-style: normal;
   letter-spacing: 0em;
   text-transform: none;
   line-height: 1.5em;
   font-size: 9px !important;
}}

Worked like a charm - Thank you so much!!!

How can you do this with an "image poster" block instead?

4 hours ago, caseyscalf said:

How can you do this with an "image poster" block instead?

Can you share link to page where you use image poster?