The new AHA Loader is fully responsive with modern looks and feel with accessibility features. The layout is using Bootstrap 4.5 with flex box.
<div class="aui-loader" role="alert" aria-live="assertive" aria-label="Page is Loading" tabindex="0"></div>
<div class="aui-block-loader" role="alert" aria-live="assertive" aria-label="Page is Loading" tabindex="0"></div>