Hello !
Dark and light themes are popular display modes in today's digital age. Dark or light themes are simply user preferences.
To switch between light and dark themes in Home-Assistant you should go to the profile settings and modify it directly from there. This is not very practical, especially if Kiyosk mode is enabled on the device. So in this article, I will describe how to change the theme from the frontend.
To do this, we need to install the "BrowserMod" integration from HACS. Follow the instructions in this link to install BrowserMod.
Note: Don't forget to enable the browser mod after installation (refer to the picture below) and give a browser ID for your device.


type: vertical-stack
cards:
- type: custom:mushroom-template-card
primary: Theme Selection
secondary: ''
icon: mdi:home-switch-outline
icon_color: gray
fill_container: true
tap_action:
action: none
hold_action:
action: none
double_tap_action:
action: none
multiline_secondary: false
layout: horizontal
badge_icon: ''
badge_color: ''
- type: horizontal-stack
cards:
- type: custom:mushroom-entity-card
entity: input_button.dark_theme
secondary_info: none
tap_action:
action: toggle
icon: mdi:palette
icon_color: black
name: Set Dark Theme
layout: vertical
- type: custom:mushroom-entity-card
entity: input_button.light_theme
secondary_info: none
tap_action:
action: toggle
icon: mdi:palette-outline
icon_color: grey
name: Set Light Theme
layout: vertical

Code for creating an automation for "Light Theme" :
alias: Set Light Theme
description: ""
trigger:
- platform: state
entity_id:
- input_button.light_theme
condition: []
action:
- service: browser_mod.set_theme
data:
dark: light
deviceID:
- office-ipad
mode: single
initial_state: "on"
Code for creating an automation for "Dark Theme" :
alias: Set Dark Theme
description: ""
trigger:
- platform: state
entity_id:
- input_button.dark_theme
condition: []
action:
- service: browser_mod.set_theme
data:
dark: dark
deviceID:
- office-ipad
mode: single
initial_state: "on"

Changing theme automatically based on the light conditions :
alias: Dark/Light Theme
description: ""
trigger:
- platform: numeric_state
entity_id:
- sensor.avatto_presence_sensor_illuminance_lux
below: 80
id: dark
- platform: numeric_state
entity_id:
- sensor.avatto_presence_sensor_illuminance_lux
above: 80
id: light
- platform: sun
event: sunrise
offset: 0
id: rise
- platform: sun
event: sunset
offset: 0
id: set
condition: []
action:
- choose:
- conditions:
- condition: trigger
id:
- dark
- set
sequence:
- service: input_button.press
metadata: {}
data: {}
target:
entity_id: input_button.dark_theme
- conditions:
- condition: trigger
id:
- light
- rise
sequence:
- service: input_button.press
metadata: {}
data: {}
target:
entity_id: input_button.light_theme
mode: single
Final result :

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