#container {
  position: relative;
  width: 600px;
  height: 600px;
  margin: auto;
  overflow: hidden;
}

#can1 {
  position: relative;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

#mygui {
  position: relative;
  width: 280px;
  height: 300px;
  display: block;
}

.rightfloat {
  float: right;
  margin: 10px
}

#b1 {
  position: absolute;
  left: 0;
  top: 0;
}

#b2 {
  position: absolute;
  left: 250px;
  top: 0;
}

#b3 {
  position: absolute;
  right: 0;
  top: 0;
}


#b1, #b2, #b3 {
  border: 0;
  line-height: 2.5;
  padding: 0 20px;
  font-size: 1rem;
  text-align: center;
  color: #fff;
  text-shadow: 2px 2px 2px #000;
  border-radius: 10px;
  background-color: rgba(51, 153, 255, 1);
  background-image: linear-gradient(to top left, rgba(0, 0, 0, 3), rgba(0, 0, 0, .2), rgba(0, 0, 0, 0));
  box-shadow: inset 2px 2px 3px rgba(255, 255, 255, .6), inset -2px -2px 3px rgba(0, 0, 0, .6);
}

#b1:hover, #b2:hover, #b3:hover {
  background-color: rgba(51, 153, 255, .2);
}

#b1:active, #b2:active, #b3:active {
  box-shadow: inset -2px -2px 3px rgba(255, 255, 255, .6), inset 2px 2px 3px rgba(0, 0, 0, .6);
}