roll back label sizes

src/styles/pdb-ligand-env-svg.css

@@ -97,13 +97,13 @@
 .pdb-lig-env-svg-node text tspan:first-child {
     cursor: inherit;
     font-weight: 100;
-    font-size: 23px;
+    font-size: 21px;
 }
 
 .pdb-lig-env-svg-node text tspan:nth-child(2) {
     cursor: inherit;
     font-weight: lighter;
-    font-size: 21px;
+    font-size: 18px;
 }
 
 .pdb-lig-env-svg-ligand-res {