fullscreen fails

The full screen button inside cesium just paints the background of my page black,
and puts my page into full screen while the cesium container remains the same size.

Now I'm using the 'Angular-Cesium' npm package, so this might not be an issue with cesium.js, it could even be an Angular issue, just thought I'd ask.

my css:

#cesiumContainer {
    width: 100%;
    height: 720px;
    margin: 0; padding: 0;
    overflow: hidden;

.map-container {
    height: 720px;
    box-shadow: 4px 4px 7px #d2d2d2;

and my css settings:
encapsulation: ViewEncapsulation.None

My guess is it’s a problem with that package, but to verify go to https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/?src=Hello%20World.html&label=Showcases and see if the full screen button works there. Unfortunately I’m not much help from the Angular side of things.