Lua OUf help if possible

[mankeluvsit]

So After about 2 years away from WoW I decided to come back, Well I found my old UI and I am trying to re create it. The problem I have right now is the Gradient and the texture, Also im trying to figure out how i gad the gradient with the HP bars (when 100% it was green and with it was less than 25% it was red), Theres some other things im trying to work on but thats what I need help with right now, Anyone know the code for what I need on? Thanks.

Here is the old image of my ui back then