how could change tab symbol color a little darker, it's so obvous now

I like this colorscheme ,it's amazing, but when i see the kernel code, i found a place of maladjustment, first i set tab symbol as **>---** to make a difference this space symbol;
when i see the code, I get the effect as below:
need help , how could i let the **>---** symbol darker make the eye more comfortable.