Fix visual glitch when error plot loads

Author: elmisback

src/herbie/ErrorPlot.css

@@ -22,7 +22,7 @@
 }
 
 .empty-error-plot {
-  height: 209px;
+  height: 214px;
 }
 
 .error-plot svg {

src/herbie/HerbieUI.tsx

@@ -927,7 +927,7 @@ function HerbieUIInner() {
             {/* <SelectableVisualization components={components} /> */}
             <div style={{fontSize: "14px", padding:"11px 0px", fontWeight: 'bold'}}>Error Plot</div>
             <ErrorPlot />
-            <h4>Other Comparisons</h4>
+            <div style={{fontSize: "14px", padding:"11px 0px", fontWeight: 'bold'}}>Other Comparisons</div>
             <SelectableVisualization components={components2} />
           </div>
         </div>