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? -

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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.