Tool-tips in light theme World-Map Plugin

We are using the world map plugin quite a lot with influxdb and IoT data (not only). Most of the time we only use dark theme. Now for a smaller project we are bound to use it within light theme. Unfortunately the tool-tips on the location dots seem to have a hard-coded light color and therefore are barely visible when using light theme (I tried with Grafana 5.2. and Grafana 4.3). Is this easy to change? Most probably a question for daniellee!?