Cosmos Components can be customized in 3 main ways, with different levels of control and complexity:
  • Changing the default styles of the root and part components,
  • Using design tokens (CSS variables aka. custom properties) to change colors, fonts, and other properties,
  • Replacing them entirely with your own custom elements.
All aspects of components are documented in the Storybook.

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Changing the default styles

As you would with any other HTML element, you can simply add your own styles to the root and part components. For example, you can make balances more uniform: 
cosmos-balance {
  background-color: #f0f0f0;
  padding: 0.5rem;
  border-radius: 0.25rem;
}

cosmos-balance::part(value) {
  font-family: monospace;
  width: 4rem;
  text-align: right;
}

cosmos-balance::part(denom) {
  text-transform: uppercase;
}

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Using design tokens

All design tokens are documented in the Storybook. All design tokens have default values, but you can override them as needed: 
:root {
  --cosmos-spacing: 10px;
  --cosmos-roundness: 6px;
  --cosmos-primary-color-500:rgb(247, 156, 65);
}
Specifying them on :root sets them for your entire application, but they can also be set on every single CSS selector you can come up with.

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Replacing components

Once a custom element has been registered, there is no way to unregister or override it. Thus, the CosmosComponents class lets you decide which components you wish to use and which you wish to replace with your own. 
import { CosmosComponents } from '@kiruse/cosmos-components';

class MyWalletModal extends HTMLElement {
  // ... define your custom element
}

CosmosComponents.default()
  .with('cosmos-modal-wallet', MyWalletModal)
  .register();
However, your custom element will need to support the same attributes/properties as the original, as some of them are used internally by the library itself (e.g. cosmos-user-address builds upon cosmos-address). All attributes are documented in the Storybook.