# Customization

You can customize some aspects of Progressively to your needs using environment variables.

Keep in mind that **certain features require both the backend and frontend `.env` files to be modified.**

{% content-ref url="customization/backend-environment-variables" %}
[backend-environment-variables](https://progressively.gitbook.io/docs/developpers/customization/backend-environment-variables)
{% endcontent-ref %}

{% content-ref url="customization/frontend-environment-variables" %}
[frontend-environment-variables](https://progressively.gitbook.io/docs/developpers/customization/frontend-environment-variables)
{% endcontent-ref %}