*{box-sizing:border-box}
  html,body{
    margin:0;
    height:100%;
    overflow:hidden;
    background:#dff4ff;
    font-family:Arial,Helvetica,sans-serif
  }
  #wrap{
    width:100vw;
    min-height:100dvh;
    display:flex;
    align-items:center;
    justify-content:center;
    padding:10px;
  }
  canvas{
    width:min(100vw - 20px,430px);
    height:auto;
    aspect-ratio:430/780;
    max-width:430px;
    max-height:calc(100dvh - 20px);
    border-radius:24px;
    box-shadow:0 18px 50px rgba(0,0,0,.22);
    background:#cfefff;
    touch-action:none;
  }