body {
  margin: 0;
  padding: 0;
  text-align: center;
  background-color: gray;
  overflow: hidden;
}

.instruction {
  width: 300px;
  height: 300px;
  position: fixed;
  background-color: rgb(252, 252, 113);
  top: 0;
  left: 0;
  border-bottom-right-radius: 10px;
}
.instruction .instruction-title {
  color: blue;
  font-size: 1.5rem;
  font-weight: 600;
}

.instruction .instruction-content {
  margin-bottom: 1rem;
  font-family: serif;
}

#myCanvas {
  background-color: rgb(196, 196, 196);
}