Prevent screen 'shaking' on invocation of a popup window

service.js

@@ -900,9 +900,7 @@ class BesPopupEl extends HTMLElement {
     this.shadowRoot.innerHTML = `
       <style>
         :host {
-          position: relative;
-          display: inline-block;
-          z-index: -1
+          display: none;
         }
         :host(.show){
           z-index: 10;
@@ -981,6 +979,7 @@ class BesPopupEl extends HTMLElement {
     this.style.position = 'fixed'
     this.style.left = `${x}px`
     this.style.top = `${y}px`
+    this.style.display = 'block'
 
     const viewportWidth = window.innerWidth
     const viewportHeight = window.innerHeight