Merge pull request #8920 from fredj/rm_relative

Remove unneeded 'relative' positioning

src/ol/renderer/Composite.js

@@ -37,7 +37,6 @@ class CompositeMapRenderer extends MapRenderer {
     style.width = '100%';
     style.height = '100%';
 
-    this.element_.style.position = 'relative';
     this.element_.className = CLASS_UNSELECTABLE;
 
     const container = map.getViewport();