How to add a drop shadow to a text box?

I have created text with a white background, but wanted a black drop shadow to appear behind this. (not on the text inside the background colour). (please see visual-ess.com for an example of what i want it to look like, and image attached. I have attached image of what I can get it to look like). I would like it for different headings throughout the website (not an image block). 

I have found codes for image block drop shadow, but can't seem to find one for text with background. 

Thank you

A good way is with code, but you'll need to find and add a block ID to CSS for each one that you want to add. If you can share your website URL site wide password and this page I can get you started.

Hi thank you so much for your response. 

My password is: 2023. I have block ID for the text boxes I want to add it to, but don't know how to add the block ID into the code. The page is the homepage. 

Thank you!

You're amazing. Thank you so much!!!