The main parameter you have to set in columns(general tab) is the font color for the column.
Here you can set background colors, paddings, margins and borders for the columns content.
Width & Responsiveness
First of all, you can change the width of your column. Additionally, you are able to set the responsive behaviour of your column in various devices or even to hide elements. Analytically:
Set the responsive behavior for the column on desktops/laptops.
Set the responsive behavior for the column on tablet devices with landscape orientation.
Set the responsive behavior for the column on tablet devices with portrait orientation.
Set the column to full width to hide it on mobile devices.