Create app.css

app.css

@@ -0,0 +1,57 @@
+.left_header {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}
+
+.right_panel {
+  margin-top: 66px;
+  border: 1px solid #BFBFC4;
+  border-radius: 8px;
+  overflow: hidden;;
+}
+
+.render_header {
+  height: 30px;
+  width: 100%;
+  padding: 5px 16px;
+  background-color: #f5f5f5;
+}
+
+.header_btn {
+  display: inline-block;
+  height: 10px;
+  width: 10px;
+  border-radius: 50%;
+  margin-right: 4px;
+}
+
+.render_header > .header_btn:nth-child(1) {
+  background-color: #f5222d;
+}
+
+.render_header > .header_btn:nth-child(2) {
+  background-color: #faad14;
+}
+.render_header > .header_btn:nth-child(3) {
+  background-color: #52c41a;
+}
+
+.right_content {
+  height: 920px; 
+  display: flex; 
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}
+
+.history_chatbot button {
+  background: none;
+  border: none;
+}
+
+.html_content {
+  width: 100%;
+  height: 920px;
+}