Increase size of logo in slide footer

lectures/custom.scss

@@ -30,6 +30,11 @@ h2 {
     text-align: right;
 }
 
+.reveal .slide-logo {
+  height: 48px !important;
+  max-height: unset !important;
+}
+
 .reveal code:not(.sourceCode) {
     /*-- reduce size of inline code --*/
     font-size: smaller;