Upload 3 files

level2.css

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+path.link {
+    fill: none;
+
+    stroke-width: 1.5px;
+}
+
+
+circle {
+    fill: #ccc;
+    stroke: #333;
+    stroke-width: 1.5px;
+}
+
+text {
+    font: 10px sans-serif;
+    pointer-events: none;
+}
+

side.css

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+/*.tree*/
+/*{*/
+/*    position: absolute;*/
+/*    top: 50%;*/
+/*    left: 50%;*/
+/*    transform: translate(-50%, -50%);*/
+/*    background-color : #4444aa;*/
+/*}*/
+/*.graph*/
+/*{*/
+/*    position: absolute;*/
+/*    top: 50%;*/
+/*    right: 50%;*/
+/*    transform: translate(50%, 50%);*/
+/*}*/
+
+#container{
+    display: flex;
+    flex-direction: row;
+    width: 100vw;
+}

tree.css

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+.node circle {
+    fill: #fff;
+    stroke: black;
+    stroke-width: 2px;
+}
+
+.node text {
+    font: 12px sans-serif;
+}
+
+.link {
+    fill: none;
+
+    stroke-width: 2px;
+}