i want to know how to setup window background color

[BillyLiou]

I found out my configuraion of it generates the window background with black color.

I'm not sure if this belong to window backgound color, do we have any options can be setup

here is my configuration

unbind r 
bind r source-file ~/.tmux.conf 

set -g prefix C-s
set -g mouse on
set -g default-terminal "tmux-256color"
setw -g mode-keys vi

bind-key h select-pane -L
bind-key j select-pane -D
bind-key k select-pane -U
bind-key l select-pane -R  

set -g base-index 1
set -g pane-base-index 1
set-window-option -g pane-base-index 1
set-option -g renumber-windows on

set-option -g status-position top

# List of plugins
set -g @plugin 'tmux-plugins/tpm'

# catpuccin/tmux plugin and configuration
set -g @plugin 'catppuccin/tmux#v2.1.2'

# Configure the catppuccin plugin
set -g @catppuccin_flavor "mocha"
set -g @catppuccin_window_status_style "rounded"
set -g @catppuccin_window_current_number_color "#{@thm_blue}"

run ~/.tmux/plugins/tmux/catppuccin.tmux
# Load catppuccin
# run ~/.config/tmux/plugins/catppuccin/tmux/catppuccin.tmux
# For TPM, instead use `run ~/.tmux/plugins/tmux/catppuccin.tmux`

# Make the status line pretty and add some modules
set -g status-right-length 100
set -g status-left-length 100
set -g status-left ""
set -g status-right "#{E:@catppuccin_status_application}"
set -agF status-right "#{E:@catppuccin_status_cpu}"
set -ag status-right "#{E:@catppuccin_status_session}"
# set -ag status-right "#{E:@catppuccin_status_uptime}"
# set -agF status-right "#{E:@catppuccin_status_battery}"


set -g @catppuccin_window_default_text "#W"
set -g @catppuccin_window_current_text "#W"
set -g @catppuccin_window_text "#W"
set-option -g automatic-rename on
set-option -g automatic-rename-format '#I #{pane_current_path}'


run ~/.tmux/plugins/tmux-cpu/cpu.tmux
run ~/.tmux/plugins/tmux-battery/battery.tmux

run '~/.tmux/plugins/tpm/tpm'

set -g status-bg default
set -g status-style bg=default

[kjnsn]

I tidied up your config a bit, hope this makes it a little easier:

unbind r 
bind r source-file ~/.tmux.conf 

set -g prefix C-s
set -g mouse on
set -g default-terminal "tmux-256color"
set -gw mode-keys vi

bind-key h select-pane -L
bind-key j select-pane -D
bind-key k select-pane -U
bind-key l select-pane -R  

set -g base-index 1
set -g pane-base-index 1
set -g pane-base-index 1
set -g renumber-windows on

set -g status-position top

# List of plugins
set -g @plugin 'tmux-plugins/tpm'

# catpuccin/tmux plugin and configuration
set -g @plugin 'catppuccin/tmux#v2.1.2'

# Configure the catppuccin plugin
set -g @catppuccin_flavor "mocha"
set -g @catppuccin_window_status_style "rounded"
set -g @catppuccin_window_current_number_color "#{@thm_blue}"
set -g @catppuccin_window_current_text "#W"
set -g @catppuccin_window_text "#W"

run ~/.tmux/plugins/tmux/catppuccin.tmux

# Make the status line pretty and add some modules
set -g status-right-length 100
set -g status-left-length 100
set -g status-left ""
set -g status-right "#{E:@catppuccin_status_application}"
set -agF status-right "#{E:@catppuccin_status_cpu}"
set -ag status-right "#{E:@catppuccin_status_session}"

run ~/.tmux/plugins/tmux-cpu/cpu.tmux

# Set the title of the terminal.
set -g automatic-rename on
set -g automatic-rename-format '#I #{pane_current_path}'

run '~/.tmux/plugins/tpm/tpm'

set -g status-style "bg=default"

It looks like something it setting set -g window-status-style "bg=black", which would cause what you are seeing. Try following the troubleshooting guide and see if that fixes your issue