The button "LOW" and "HIGH" didn't display correctly on Edge

[yanlxu]

Repro steps:
• Navigate to https://makecode.adafruit.com/beta on Edge
• Drag the blocks as the followed picture
• Switch between the "LOW" and "HIGH"

Expected result:
The button "LOW" and "HIGH" should displayed correctly, just like on the Chrome, FireFox, IE
Actual result:
The button "LOW" and "HIGH" didn't display correctly on Edge

Edge:

Chrome, FireFox, IE:

[yanlxu]

close as fixed

[lock]

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