fix #1411 Classic Test Runner: make iframe semi-transparent
fix #1411 Classic Test Runner: make iframe semi-transparent

This commit makes an iframe used to run the test in Classic Test Runner
in isolated mode semi-transparent, in order to easily follow the progress
of the test suite, which happens in background.

vcarle/ariatemplates,fcapa/aria,fbasso/ariatemplates,simonarbuckle/ariatemplates,vcarle/ariatemplates,ymeine/ariatemplates,divdavem/ariatemplates,vcarle/ariatemplates,ariatemplates/ariatemplates,ariatemplates/ariatemplates,fbasso/ariatemplates,benouat/ariatemplates,fbasso/ariatemplates,fcapa/aria,benouat/ariatemplates,divdavem/ariatemplates,divdavem/ariatemplates,mlaval/ariatemplates,mlaval/ariatemplates,simonarbuckle/ariatemplates,benouat/ariatemplates,ymeine/ariatemplates,fcapa/aria,ymeine/ariatemplates,mlaval/ariatemplates,simonarbuckle/ariatemplates,ariatemplates/ariatemplates