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index.html

@@ -9,8 +9,10 @@
     <script type="text/javascript" src="https://unpkg.com/vis-network/standalone/umd/vis-network.min.js"></script>
     <style>
         #network {
-            width: 100%;
-            height: 1200px;
+            margin-left: auto;
+            margin-right: auto;
+            width: 80%;
+            height: 800px;
             border: 1px solid black;
             border-radius: 4px;
             margin-top: 20px;