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# Adding custom CSS to your theme
In this field, we already split to some responsive devices like **Global Custom CSS; Custom CSS for only desktop; Custom CSS for tablet, mobile; Custom CSS for only tablet; Custom CSS for only mobile**. You can write your code to the correct field.
**For example**: You want to change the Background color for Shopping Cart Widget and displays it on all devices, you can add this Code to **Global Custom Css**.
### 1. Add Custom Css in Theme Settings
Custom CSS can be added to your entire theme that affects all pages in your online store except the **Checkout** page. For example, you can change the way that buttons are displayed across your entire store.
1. In your Shopify admin, go to **Online Store** -> **Themes**.
2. Find the theme that you want to edit, and then click **Customize**.
3. Click **Theme settings -> Custom Css**.
4. Add your code and click **Save**.
{% hint style="info" %}
Your css will be saved in **settings\_data.json** file
{% endhint %}