.DrawContent{
  position: absolute;
  top: 10px; right: 100px; bottom: 10px; left: 60px;
  border: solid 1px #333;
  background: #fff;
  overflow: hidden;  
}

.DrawContent-canvasCtn{
  position: absolute; 
  top: 0; right: 0; bottom: 0; left: 0;
}