Hard to see the digest when hovering on it in Logs window

[v-dantch]

OS: Win10 / Mac
Node.js: V10.13.0
Build Definition: 20181128.2

Repro Steps:

1. Create a build task(please refer to below link:
   
2. Run a task.
3. View Azure logs.
4. In Logs window, hover on the digest.

Expect:
Easy to see the entire digest.

Actual:
Hard to see the digest.