I am a new blender user and I'm following a bunch of tutorials to learn about the tool. I recently came across a camera tutorial and ran into a minor problem. After selecting the camera, I was changing the type and scale and wanted to reset the cursor position and pressed Shift + C. Instead of changing the position, it removed the dark border around the camera. How do I restore it back to its default view? Also, is it any different to remove the dark border? screenshot for details: https://bmoondesign.d.pr/XmbHGb
If you really just pressed SHIFT+C then you changed your view to show all objects in the scene. To get back into camera perspective press Numpad 0.
If you disabled the passepartout instead, select the camera and check Passepartout in the camera tab. The setting has no influence on the rendering only on the display in the viewport.