Newly added media css affecting form action buttons

Problem/Motivation

#3304229: Newly added media css affecting form action buttons documented a problem in Bootstrap Barrio 5.5.5 where all form action buttons became sticky. The same is true for 5.1.7.

Css code causing the issue:

.form-actions {
  position: sticky;
  bottom: 0;
  background: #fff;
  padding: 5px;
}

Steps to reproduce

• Update the theme version to 5.1.7 through composer or manually
• Update the permissions to enable a non admin role to add a content for any content type(with lots of fields)
• Go to the node add form and start scrolling down.
• Observe that the submit button becomes sticky.

Proposed resolution

Backport the fix from #3304229: Newly added media css affecting form action buttons.