<template id="overlay-template">
  <style>
    overlay-mask {
      left: 0;
      padding: 8px;
      position: absolute;
      top: 0;
      z-index: 1000;
      font-family: sans-serif;
      -webkit-justify-content: center;
      background: rgba(0, 0, 0, 0.8);
      display: flex;
      height: 100%;
      left: 0;
      position: fixed;
      top: 0;
      width: 100%;
    }