Prettify Google Hangout

gistfile1.txt

For Google Chrome:
1) Install userScriptCSS extension: 
https://chrome.google.com/webstore/detail/userscriptcss/pdfbjinabdohnegjnbfgdgohlhegamnm

2) Settings -> Extensions -> userScriptCSS -> Options

3) Fill fields:

Enter a URL regexp here: https://plus.google.com/hangouts/_/.*
   
Enter your user stylesheet here:

.qa-Rc-P{z-index:40000;position:relative;}.qa-L{width:100px;height:100px;}.qa-ec-L.qa-Xa-L
{width:100%;z-index:1004;position:relative;height:100%;}.yb-fa{width:100%;}.qa-P.qa-hb-y,
.Xc-X-ia-yh,.qa-Xc-Xa.qa-ec-L.qa-Zg,.f-pn-y.Ow,.qa-P.qa-Jr-y{display:none;}
.o-aa-ee>*>*>*>*>*>.o-aa-w{vertical-align:top;}