How to apply dynamic styling to a MatHeaderCell using NgStyle?

My goal is to dynamically style a MatHeaderCell instance using the following code:

[ngStyle]="styleHeaderCell(c)"

Check out my demo here.

After examining, I noticed that:

styleHeaderCell(c)

It receives the column and returns an object, however, the style changes are not being applied. The column still has a minimum width of 12rem but I want it to be 4rem. Any suggestions?

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