CSS- I made a mess!

This is a very good widget. The problem is I am weak in the CSS area.

I added ‘my-video-textbox’ in the CSS Classes field.

Then I added:

<style type=”text/css”>
#my-video-textbox {
background: none; border: none;
}
</style>

to the Content field, but I am still unable to remove the blue borders or frame around the video.

When I inspected the Element is revealed:

.home .textwidget {
background: #87CEFA !important;
color: #fff !important;
font-size: 15px !important;

so I tried

.home .textwidget .my-video-textbox

in both My Custom CSS sheet and in the Content Field in the widget.

I’ve been on this all evening and have run out of ideas, so any help would be appreciated.

Here’s a link if it would help: https://urlgone.com/4b4c57/

Thank you.

https://www.ads-software.com/plugins/enhanced-text-widget/