Bug 1018283 - [Follow-up 951665] Pending visual revision and adjustments of the VR call screen when in lockscreen

Add a comment: /* 1.2rem is half the size of the status bar */
If you can find where the status bar height is defined, I'd add a comment in oncall.css and the file where status bar is defined saying:
/* keep this value in sync with [oncall.css|status_bar_height.css] */