Blog Preview Card Using Vanilla CSS and BEM Methodology

One of the challenges was to resize the text without using media queries. Were they hinting at using REM or vh/vw? Any tips on going about this? I guess with either approach we could calculate what the respective value would be.

If you have some more time, could you let me know what you think about HTML/CSS structure? I tried to pick up the BEM methodology. Thank you in advance!