it would be nice someone could add this from the post i linked, i think a dot looks more nice than what we have now. i have changed it myself but after updating to the newest it is gone.
The problem is that @Patjee changed the vendor files directly, so, I guess these changes got overridden at some point.
I have slightly changed the implementation, so that the style changes for the spectrum color-picker are now defined as part led-light.css. Moreover, I have added the style changes to get the round color-preview back.
There is still the problem of the of the wide space between the switch and the color preview item which now becomes more visible as the rectangular preview required more width. Anyhow, I am not sure this commit will make it into an release as @philip1986 is working on a new color picker. If you want to give at try though, you can clone it from the branch
round-color-preview at https://github.com/philip1986/pimatic-led-light.
"It always takes longer than you expect, even when you take into account Hofstadter's Law.", Hofstadter's Law