How to style a button

It looks as if this code will not work as it need to be opened with similar javascript.

What I am trying to do is to open a new page with target=“_blank” which will not have any navigation, and obviously will not have a back button active. The only way to carry on is to close the page and be back on the original one.

The visitor has only one option: leave by clicking on the red X in the top corner (or pressing ALT F4).

I would like to place a large button, (with an explanation below: “Press to return to the previous page”) that did exactly the same.

How can do that be done?