Added a class to the label canvas for styling. #2943

Author: geoffreykwan

src/main/webapp/wise5/components/label/label-grading/label-grading.component.html

@@ -3,7 +3,7 @@
     <canvas id='{{canvasId}}'
         width='800'
         height='600'
-        style='border:1px solid black;'>
+        class='label-canvas'>
     </canvas>
   </div>
 </div>

src/main/webapp/wise5/components/label/label-grading/label-grading.component.scss

@@ -0,0 +1,3 @@
+.label-canvas {
+  border: 1px solid black;
+}