Fix the building tooltip flying off the screen

gorge.js

@@ -651,7 +651,15 @@ function buildingTooltip(id, event) {
   let yOffset = tooltip.parentElement.getBoundingClientRect().y;
 
   let xPos = tooltip.parentElement.getBoundingClientRect().x - 450;
-  let yPos = event.clientY;
+  
+  // wow browsers are bad
+
+  var body = document.body,
+    html = document.documentElement;
+
+  var height = Math.max( body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight );
+
+  let yPos = Math.min(event.clientY, height - 200);
 
   tooltip.style.setProperty("transform", "translate(" + xPos + "px, " + yPos  + "px)")
 }