Sidekick effected by CSS

This is an odd one. My front end guys gave me a standard CSS that they use for the majority of our (non AEM) web sites and I added that into to design for an AEM template/page. The CSS has the desired effect on styling of the HTML however, small parts of it have a strange effect on Sidekick.

For example here is one part of this large CSS

td, html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { border: 0; font-size: 100%; font: inherit; margin: 0; padding: 0; vertical-align: baseline; }

Notice the td that starts it off.

I have a parsys on the page and when I view this in DESIGN mode and click 'Edit' this is what Edit Component dialogue looks like (note the double OK and Cancel buttons) :-

[img]Edit_Double_Btns.jpg[/img]

Another even more dramatic effect results when this bit of CSS is left in :-

legend { left: -9999px; position: absolute; } label { display: block; font-size: 1.4em; line-height: 1.2857; margin-bottom: 0.5em; }

This is what the Edit Component dialog looks like now (note all the icons and descriptions have disappeared and the overlayed 'Draw Anchors') :-

[img]Edit_No_Images.jpg[/img]

Anybody got any idea what is going on here ?

Regards

Fraser.