refactor block generator and use some new field

SuperScriptViewer/static/site.css

@@ -17,6 +17,24 @@ p.block-text {
     position: absolute; 
     margin: 0; 
     padding: 0;
+    font-size: 12px;
+    color: black;
+}
+
+p.block-expandable-text {
+    position: absolute; 
+    margin: 0; 
+    padding: 0;
+    font-size: 12px;
+    color: #5f5f5f;
+}
+
+p.block-asstext {
+    position: absolute; 
+    margin: 0; 
+    padding: 0;
+    font-size: 9px;
+    color: white
 }
 
 div.block-body {