1. vim ~/.tmux.conf
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#-------------------------------------------------------#
#Pane colours
#-------------------------------------------------------#
# set inactive/active window styles
set -g window-style 'fg=colour247,bg=colour236'
set -g window-active-style 'fg=colour250,bg=black'
 
#pane border
set -g pane-border-bg colour235
set -g pane-border-fg colour238
set -g pane-active-border-bg colour236
set -g pane-active-border-fg colour51
#-------------------------------------------------------#

  1. vim ~/.vim/plugged/vim-colors-solarized/colors/solarized.vim

hi Normal ctermfg=238 ctermbg=NONE

Reference
  1. tmux: setting active/inactive pane colours