Several fixes and changes
* fixed margin-top and margin-button for list modules in order to provide a unified design
* changed the position of the scroll to top button and replaced the arrow image with native css arrow
* replaced the arrow image of the modified login module with native css arrow

For the replacement of arrow images in an accordion menu are further instructions needed. Looking on the current state of the template, the implementation of jpg images has significantly decreased. It is an overall aim to reduce the utilization of images to the slides module only.