The theme tab allows you to customize the look of your bot.
Bot theme customization

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General

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

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Typography

You can change the font of your bot in the Theme tab under the Global section. There, you can choose between choosing a font from Google Fonts or defining your own custom font.

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Chat

This section allows you to customize all the chats components (avatars, bubbles, inputs etc…).

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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: 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: 
.bot-button {
  border-radius: 40px;
  background-image: linear-gradient(to right, #e052a0, #f15c41);
  border: none;
}