Update custom.scss

Author: KristinaYFischer

docs/_sass/custom/custom.scss

@@ -16,20 +16,20 @@
 
 .label-required:not(g) {
   background-color: #df8f8f;
-  color: #fff;
+  color: #4b0b0b;
 }
 
 .label-conditional:not(g) {
   background-color: #ffcfc9;
-  color: #fff;
+  color: #b10202;
 }
 
 .label-recommended:not(g) {
   background-color: #ffcfc9;
-  color: #fff;
+  color: #11734b;
 }
 
 .label-optional:not(g) {
   background-color: #c6dbe1;
-  color: #fff;
+  color: #215a6c;
 }