Describe the bug
We still have small rendering problems with labels on axis.
Longer text labels are partially displayed in Chrome because of wrong measurement.

To Reproduce
Steps to reproduce the behavior:

1. Create a story that display x time scale with a full ISO string with timezone
2. The labels are truncated on the timezone as on the screenshot

Expected behavior
The label is fully rendered

Screenshots

Version (please complete the following information):

• OS: Mac OSX
• Browser: Chrome
• Elastic Charts: master

Additional context
n/a

Errors in browser console
n/a

Kibana Cross Issues
n/a

Checklist

• every related Kibana issue is listed under Kibana Cross Issues list
• kibana cross issue tag is associated to the issue if any kibana cross issue is present