Change text size within CARD IMAGE on mobile view

Hi, 

I'm having trouble scaling the text size for my card images for both headings and subheadings on mobile and tablet.

If anyone knows the CSS code for this that would be appreciated! 

Many thanks!

@embroom Add to Home > Design > Custom CSS

@media screen and (max-width:640px) {
/* Title */
.image-card-wrapper .image-title * {
    font-size: 50px !important;
}
/* Sub title */
.image-card-wrapper .image-subtitle-wrapper * {
    font-size: 20px !important;
}
}

Thanks for the quick reply! unfortunately this didn't work..

Any other suggestions? 

sorry, forgot, the code only works for mobile, change 640px to 990px

If it still doesn't work for both, can you share site url? i can take a look.

Super! Worked a treat 

Thanks so much 

@embroom You can like (heart icon, bottom right) & upvote, if the question is correct. Thanks.