Material Design Responsive Activity Indicator
<link rel='stylesheet' href='ac.css'>
<script src='ac.js'> </script>
<script src='https://cdn.jsdelivr.net/npm/activity-indicator-material@1.0.2/ac.js'></script>
<link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/activity-indicator-material@1.0.2/ac.css'>
<svg class="spinner" width="65px" height="65px" viewBox="0 0 66 66" xmlns="http://www.w3.org/2000/svg">
activityIndicator.show() // displays full screen activity indicator
activityIndicator.hide() // removes activity indicator