Adding a Semi-transparaent background between the Text and backgrounds

Hi i need some help to make a semi-transparent background behind the text in the (name of site in the site on the slider) & "THINGS TO DO" & "TOURS" & "LEARN & DISCOVER" & "PLAN A TRIP" sections see screenshot attached

I did something similar a while ago, but unsure how i can re-create it for the current site and if i need to do it for other sections of the site? - https://premium.wpmudev.org/forums/topic/adding-a-grey-transparent-background-behind-the-account-page-content

Support Access is open
domain - http://tinyurl.com/jogne7k

Please dont post any brand related information/ screenshots or domain links as i have had issues with google caching this information and linking it to their google searches of my site ... very bad for brand... please use temporary image upload / tiny url / pastebin etc to mask this information.

Thanks

Tom