.my-drawing {
  height: 750px;
  width: 100%;
  border: 1px solid #000;
  position: relative;
}

.buttons {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
}

.button1, .button2, .button3, .button4 {
  margin-right: 5px;
  padding: 5px 10px;
  background-color: #f0f0f0;
  border: 1px solid #ccc;
  cursor: pointer;
  display: inline-block;
}