<button id="violet-pra-btn" class="violet-pra-btn" >cus event</button>
<button id="violet-close-btn" class="violet-close-btn" >close</button>

<canvas id="allWebOfficeAx" style="width:100%;height:90vh">
  <p class="error">Sorry, It looks as though your browser does not support the canvas tag.</p>
</canvas>