.tmux.conf

 set-option -g history-limit 100000
# only this line might not be enough
set -g default-terminal "screen-256color"
# Needs this line also to overrides the default color
set-option -ga terminal-overrides ",xterm-256color:Tc"
set -g mouse on

# status
set -g status-bg "#55298b"
set -g status-fg "#ffffff"

# pane border
set -g pane-border-style fg='#505050'
set -g pane-active-border-style fg='#55298b'

set -g base-index 1