Created by: kkirsche
Fix #16973 (closed)
As 30px was hard coded for the following attribute values: width, height, and font-size, I have used the same pixel formula for each of these three as the @carousel-control-width is a percent value not a pixel value in variables.less
If margin-top should be calculated we can also do that with a (@carousel-control-font-size * -0.75)