Initial version

src/index.css

@@ -0,0 +1,35 @@
+body, html, #root {
+  height: 100%;
+}
+
+.node {
+  cursor: pointer;
+}
+
+.root {
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+}
+
+#svgContainer {
+  flex: 1 1 auto;
+  overflow: scroll;
+}
+
+.hidden {
+  display: none;
+}
+
+p.comment {
+  margin-top: 16px;
+}
+
+div.ui.negative.message {
+  margin: auto;
+}
+
+div.ui.card.intro {
+  width: 600px;
+  margin: auto;
+}