minor style changes to improve readability

ner.edith.html

@@ -9,7 +9,7 @@
     <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
     <script type="text/javascript" src="http://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
     <style>
-        body{font-family:Open Sans;font-size:16px}
+        body{font-family:Verdana;font-size:16px}
         table{table-layout:fixed;width:100%;text-align:center}
         th{background-color:lightgray}
         .editable:hover{background-color:yellow}
@@ -42,7 +42,7 @@
         <div class="col-8">
             <div class="row">
                 <div class="col text-center">
-                    <h1>ner.edith: <br/> named entity recognition editor in html</h1>
+                    <h3>ner.edith: <br/> named entity recognition editor in html</h3>
                 </div>
             </div>
         </div>