What is the current behavior?

When you click on the Clear button, the X overlay is not visible.

Please provide the steps to reproduce and create a JSFiddle.

1. Open https://simonwep.github.io/pickr/
2. Click on the color button to show the color picker
3. Click Clear button

What is the expected behavior?

The color button gets transparent and a X overlay is added to indicate that there's no color selected.

Your environment:

Version (see Pickr.version): 1.8.1
Used bundle (es5 or normal one): es5
Used theme (default is classic): classic
Browser-version: Chrome 89.0.4389.114
Operating-system:  Ubuntu 20.04