BenJLiu :
Tech_TTT :
paint them white .. cut out a tape the same letters put the tape on the letters , paint white , remove tape.
Could you please give me a more detailed tutorial. I'm new to pc building so I don't know much about computers, gpu, cpu ,etc.
This is simple Painting has nothing to do with PC building.
The easiest way is to color the letters White ... and to make them look perfect cut out the same letters on a sticker and stick it on the letter and apply paint on that sticker and remove the sticker you will have a new color painted letter.
the other way is painting the whole thing any look you like , then you can see this
https://www.youtube.com/watch?v=7JoEdrR0z6I
and this
https://www.youtube.com/watch?v=gGmy2Yz5gmw
here is how you cut letter for painting them on other surfaces , actually not only letters can be any art.
https://www.youtube.com/watch?v=ppi1llAP0z8
in your case is easier, get transparent sheet , put it on your card letters and coy them , then put the transparent sheet on a sticker sheet , cut the letters out , then stick them on the card over the letters and paint.