Hi there,
You have a couple options for adding content below the widgets:
a) Use the Copyright add-on – go to “Appearance > GeneratePress” and add your HTML to the copyright area.
b) Use GP Hooks and add your HTML to the “After Footer Widgets” hook, or any of the hooks below it.
c) If you don’t want to use either of the add-ons, I can give you a PHP function which will hook into the area you want it to.
As for the spacing above your widgets, give this CSS a try:
.sidebar .textwidget p:last-child {
margin-bottom: 10px;
}
Adjust the pixels as needed 🙂