Adjust visibility of the light mode toggle

**Is your feature request related to a problem?**
I noticed that the toggle for switching from light mode to dark mode is almost invisible in the light mode.

**Screenshot:**

**Describe the solution you'd like**
Therefore, I would suggest that you change the background color of the toggle from #ececec to #6482ff.

**Describe alternatives you've considered**
An alternative would be to change the entire background of the website. However, it should be noted that the text would still be legible.

**Additional context**
The color #6482ff is also used for other elements on the website and in addition, the toggle then looks like a sun with a blue sky.

**Exemple:**