The theme tab allows you to customize the look of your zazubot.

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Global

This section allows you to enable or disable the zazubot branding, change the font and the background of your bot.

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Chat

This section allows you to customize all the chats components (avatars, bubbles, inputs etc…). Click on the bot avatar to change the image:
Avatar

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Custom CSS

You can also decide to customize even further by adding any custom CSS you want. For this you right-click on the bot in the Theme page and inspect the element you want to customize:
Custom css inspection
For example, if I want my buttons to be more rounded, and have a fancy gradient color, I can add this to the custom CSS: 
.typebot-button {
  border-radius: 40px;
  background-image: linear-gradient(to right, #e052a0, #f15c41);
  border: none;
}
Fancy button

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Customize a single button color

Thanks to custom CSS, you can customize the color of a single button for example by using the data-itemid attribute: 
[data-itemid="cl3iunm4p000f2e6gfr8cznnn"] {
  background-color: gray;
  border-color: gray;
}
To find the item ID of a button, right-click on the button and inspect the element:
Button inspect