Hi there,
Happy new year to you too ๐
If you right click on the CTA element then use browser inspect, you can see exactly how it was created and the CSS associated with it. This shouldn’t be theme related as it’s just HTML.
As for specific sidebar color, this CSS would color the first sidebar widget:
.sidebar .widget:first-child {
background-color: #e86000;
color: #fff;
}
The idea is coming from this site in our library:
https://gpsites.co/marketer/