I’ve got a question about the sidebar. Is ist possible to have a second Textwidget in the Sidebar without any padding & margin? I would like to use both: one Textwidget as it is till now and a second one without padding & margin.
Yes it is but you’ll need to target that specific text widget and remove the padding with some css. Each widget wordpress adds to sidebars gets a unique ID that can be used for custom CSS changes just like this.