Make sure they are firmly connected.
Gap between light switch and wall.
Your area looka a bit rough so the contact paper might have a tough time laying flat.
Twist the white wire from the light fixture to the white wire coming from the wall using a clockwise motion.
I think they invented them just for situations like this.
Plastic shims are a fast easy solution for backsplash electrical outlets in which the wall box is recessed below tiling quartz granite paneling etc.
Look for some oversized cover plates.
In situations where drywall workmanship is sloppier creating a large gap between the electrical box and the drywall or in cases where removal of an old cover plate leaves an old paint line then use of the preferred or even the oversized cover plates work well.
This can happen when you remove wall paneling tile wainscot or batten.
If you have a switch or receptacle that sits below the surface of the wall just twist apart or fold up and stack these caterpillar spacers to get fine adjustment of your devices light switches receptacles dimmers or any other electrical control.
When you add a switch or outlet cover there s a gap between the cover the wall.
Twist the ground wire coming from your light fixture to the ground wire coming from the wall using a clockwise motion.
Find the right depth for your needs.
If the gap is bigger and lopsided use foam sealant that s formulated for use around doors and window framing.
If the gap between the electrical box and the drywall is less than 1 4 in fill it with acrylic latex caulk.
Twist your wire cap on to secure the two wires.
Typically the standard size is used for new construction where construction tolerances are tighter.