Moved CSS to its own file

demo/src/css_style.py

@@ -0,0 +1,27 @@
+css = """
+#model-3d {
+height: 512px;
+}
+#model-2d {
+height: 512px;
+margin: auto;
+}
+#upload {
+height: 110px;
+}
+#run-button {
+height: 110px;
+width: 150px;
+}
+#toggle-button {
+height: 47px;
+width: 150px;
+}
+#logs-button {
+height: 47px;
+width: 150px;
+}
+#logs {
+height: auto
+}
+"""