Embed metrics in issue chart tooltip styling is inconsistent compared to dashboard

Dashboard	Embed metrics in issue

As seen from the screenshots, the chart tooltip styling is a little off when the metrics are embedded in an issue. The styling of our markdown is quite deeply nested, so it is quite likely that is the reason for the styling inconsistency

Reproduction link (monitor team only): https://gitlab.com/jivanvl/test-node-project/issues/2