body{
  overflow:hidden;
  background-color:#ffffff;
  font-family:monospace;
}

#demo{
  text-align:center;
  position:relative;
}

canvas{
  display: block;
  margin: auto;
  width: 100vmin;
  aspect-ratio: 1 / 1;
  cursor:crosshair;
}

textarea{
  position:fixed;
  top:0;
  right:0;
  width:180px;
  height:100%;
  font-size:18px;
  padding-bottom:80px;
  box-sizing: border-box;
}
.isPortrait textarea{
  top:70%;
  height:30%;
}

button{
  position:fixed;
  bottom:0;
  right:0;
  width:160px;
  height:32px;
  z-index:3;
  font-size:18px;
}
label{
  position:fixed;
  bottom:32px;
  right:0;
  width:160px;
  height:32px;
  z-index:3;
  font-size:18px;
}