Describe the bug
component is rendered with unexpected horizontal line at the top in Safari v15.0 browser.
To Reproduce
Steps to reproduce the behavior:
- Go to https://nova-ui.solarwinds.io/bits/release_v11.8.x/components/PanelComponent.html#example in Safari v15.0
- Review any usage example
Expected behavior
component is clearly rendered with no unexpected elements
Screenshots

Environment (please complete the following information):
- OS: MacOS Big Sur v.11.6
- Browser: Safari
- Browser Version: Version 15.0 (16612.1.29.41.4, 16612)
Additional context
Assumption is that current issue is caused by 'background' style of underlying '.nui-scroll-shadows' class.
Issue stops reproducing when disabling this style in browser 'Elements' tool:
