use css for positioning navigator (closes #412) (#766)

Author: AcrylonitrileButadieneStyrene

play.css

@@ -2043,6 +2043,7 @@ html[dir="rtl"] #chatBorder {
 }
 
 #explorerContainer {
+  position: relative;
   display: inline-block;
   height: 300px;
   text-align: center;
@@ -2073,6 +2074,7 @@ html[dir="rtl"] #chatBorder {
 
 #explorerUndiscoveredLocationsLink {
   position: absolute;
+  left: 0px;
   padding: 12px;
 }
 

play.js

@@ -1736,9 +1736,6 @@ function onResize() {
       : document.getElementById('chatboxContainer');
     if (explorerContainer.parentElement !== explorerParent)
       explorerParent.appendChild(explorerContainer);
-    const explorerFrame = document.getElementById('explorerFrame');
-    const explorerUndiscoveredLocationsLink = document.getElementById('explorerUndiscoveredLocationsLink');
-    explorerUndiscoveredLocationsLink.style.left = `${explorerFrame.offsetLeft}px`;
   }
 
   updateCanvasFullscreenSize();