Wrong background in specification images of the Select and Text Input components

[GomezIvann]

In both Select and Text Input documentation pages, there are some specification images with a #ffffff background color. This is wrong since every input has a transparent background color (unless the disabled variant).

[github-actions[bot]]

This issue is stale because it has been open for 15 days with no activity. If there are no further updates or modifications within the next 15 days, it will be automatically closed.