To fix Issue#4, panel display

This PR is designed to address Issue#4 on your repository as well as the related issues as described in the OctoPrint forum thread here.

Adjusted style of the outer-most DIV tag to have a minimum height, required when you're under the control of OctoPrint's scrollable class.
Added a stylesheet to your project.
Added placeholder text for your input tags so that people can more easily determine what each does.
Added a title attribute to the green rectangle UL element so that people know to right-mouse click it.
Added a p element to further make this known to your users how this works.

Tested in the latest Safari and seems to behave even under the Themeify -> Discorded theme.

Salandora / OctoPrint-SystemCommandEditor