/* body {background-color: gray;} */

html, body {
  width:  100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: red;    // Change to white for deployment
}

#mainCanvas
{
  width: 100%;
  height: 100%;
  background: gray;
}

.myButt {
  display: inline-block;
  cursor: pointer;
  padding: 0;
  border: none;
  background: none;
}