Sidebar widgets border

I am using sydney them for my book blog. I need to change the border, font color and background for the sidebar widgets. I could change the background of the whole sidebar through customize option. However, I need to he widgets in the sidbar each to have a border for itself.

Hello there,

Please share a link to the page where you want to make these changes. We have to inspect your page in order to generate precise code, thanks.

All the Best!