[oclug] OT: CSS help

[Bob Lockie]

I've got the following CSS:
 
          .domainH: { color: White; background: #dcdcdc; 
font-weight:bold; text-align: center }

and the following HTML:
<h1 class=domainH>Domain details</h1>

.domainH { color: black; background: #dcdcdc; cellspacing: 10px; 
border-top: #FFFFFF 1px solid; border-bottom: #000000 1px solid; 
border-left: #FFFFFF 1px solid; border-right: #000000 1px solid; width: 
20; height: 20; text-align: center; font-weight:bold; }

The first style works and the second doesn't.
Can anybody see why?