Set a max-width on headshots

Author: southgate

slides/dependencies/themes/github/css/overrides.scss

@@ -18,7 +18,10 @@ html, body, .reveal{
 img{
 	height: auto !important;
 	width: 100% !important;
+}
 
+img.headshot {
+  max-width: 50%;
 }
 
 .reveal .roll span:after{

slides/dependencies/themes/github/css/theme.css

@@ -27,6 +27,9 @@ img {
   height: auto !important;
   width: 100% !important; }
 
+img.headshot {
+  max-width: 50%; }
+
 .reveal .roll span:after {
   content: none; }