Center submit button

Co-Authored-By: Iris Scholten <ischolten.is@gmail.com>

ui/src/dashboards/components/ImportDashboardMappings.scss

@@ -60,3 +60,13 @@
   padding-right: 0;
 }
 
+.dash-map--footer {
+  width: 100%;
+  display: flex;
+  justify-content: center;
+  margin-top: 30px;
+}
+
+.dash-map--submit {
+  width: 140px;
+}

ui/src/dashboards/components/ImportDashboardMappings.tsx

@@ -66,9 +66,14 @@ class ImportDashboardMappings extends Component<Props, State> {
       <>
         {this.description}
         {this.table}
-        <button className="btn btn-sm btn-success" onClick={this.handleSubmit}>
-          Done
-        </button>
+        <div className="dash-map--footer">
+          <button
+            className="dash-map--submit btn btn-sm btn-success"
+            onClick={this.handleSubmit}
+          >
+            Done
+          </button>
+        </div>
       </>
     )
   }