Simple Tmux configuration - adapted from Prag Prog's Tmux 2 Book

.tmux.conf

set -g default-terminal "screen-256color"
# set base index to windows to 1
set -g base-index 1
# set base index for panes to 1
setw -g pane-base-index 1
# reload the config file with Prefix-r 
bind r source-file ~/.tmux.conf
# vertical and horizontal splits
bind | split-window -h
bind - split-window -v
# moving between panes with Prefix h,j,k,l​
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R
# kill panes and bindows
bind q killp
bind Q killw
# Quick window selection
bind -r C-h select-window -t :-
bind -r C-l select-window -t :+
# resize panes
bind H resize-pane -L 5
bind J resize-pane -D 5
bind K resize-pane -U 5
bind L resize-pane -R 5
set -g mouse on
set -g status-style fg=white,bg=colour237
set -g window-status-style fg=colour245,bg=colour54,bold
# set the pane style
setw -g pane-border-style fg=red,bg=black
setw -g pane-active-border-style fg=green,bold,bg=black
# message prompt styling
set -g message-style fg=white,bold,bg=black
# dim inactive panes
setw -g window-style fg=colour240,bg=colour235
setw -g window-active-style fg=white,bg=black
set -g status-justify centre
set -g status-left-length 34
set -g status-left "#[fg=green]Session: #S #[fg=yellow]#I #[fg=cyan]#P"
setw -g monitor-activity on
set -g visual-activity on