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# Migration guide for @uploadcare/blocks v0.49.0

> Migration guide for @uploadcare/blocks v0.49.0

## BREAKING CHANGES

* The prefix `uc-` has been added to all css classes.

## How to migrate

### Case 1. You were using default css.

If you were using the default styles, you don't need to do anything.

### Case 2. You were using custom css.

If you override the styles, you should note that we added the `uc-` prefix to all class selectors.

For example, you need to hide the **Done** button:

```css
.done-btn {
  display: none;
}
```

You need to add an `uc-` to class:

```css
.uc-done-btn {
  display: none;
}
```