Does it matter which country I am in to pursue this dive?

The best news about studying HTML/CSS is that no matter where you are in the world, you can quite easily improve your HTML/CSS skills. As long as you have access to a laptop, you will be able to practice your skills, improving every day.

The bottom line, the answer is no: it doesn't matter at all which country you are in. Wherever you are, you can start learning or improve your HTML/CSS. Truly, these days, if you want to become fluent in HTML/CSS, and you aren't currently fluent, the only reason is: "YOU ARE LAZY". 

Remember the Break Diver's Creed: No Rules. No Excuses. No Regrets.