This bookmarklet will put Sassmeister into presenter mode. I used it for screenshots for my talk.
javascript:(function(){var%20h,m,f;h=$('.site_header'),m=$('.main_body'),f=$('footer');if(h.is(':visible')){h.hide();m.css({top:0,bottom:0});f.hide();}else{h.show();m.css({top:'3.33333em',bottom:'1.77778em'});f.show()}}());
If you zoom in a bit and get the single column layout, you can use this bookmarklet to remove all other Sassmeister chrome.
javascript:(function(){var%20h,c;h=$('.editor-header'),c=$('.single-column%20#casement');if(h.is(':visible')){h.hide();c.css({top:'0'});}else{h.show();c.css({top:'1.5em'});}}());