Fullscreen Slider - how

Hello,
What width and height settings do I need to select so that the slider image automatically extends across the entire width of the monitor? (blue arrows) regardless of the actual number of pixels. I have already entered 100% or "max", but I always have a white border right and left? or do I have to set this in Joomla?
And how do I remove the border at the top? (green arrow)

Hi
please give me your url to check. But I think that your template has a width set as a box layout, the slideshow will take all the place that is allowed by the template. It can not extend over the limits
you must set an area in your template that is 100% full width, then load the slideshow in it
CEd