It really looks best if you set your terminal to green foreground and black background and don't modify the prompt to a green foreground color. I don't know the color code for lime green, so I used green.
# terminal with green foreground, black background
# no need to set green foreground/background color
export PS1="\e[1;37m[\u@\W]\$ \e[0m"
# terminal with white foreground, black background
# or black foreground, white background
export PS1="\e[1;37;40m[\u@\W]\$\e[0;32m "
\e[32m green foreground
\e[37m white foreground
\e[40m black background
\e[0m end sequence
You can also try
\e[92m light green...