h1 {
  font-family: arial;
  color: dimgray
}

div {
  width: 240pt;
  padding: 5pt;
  margin: 10pt;
  border: 1px solid black;
  font-size: 16pt;
}
canvas {
  width: 300pt;
  height: 300pt;
  padding: 5pt;
  margin: 10pt;
  border: 3px solid black;
  font-size: 16pt;
}

#id_a {
  background-color: lightsteelblue;
}

#id_b{
  background-color: lightpink
}

.class1 {
  background-color: white;
  border: 4px solid black;
}

.class2 {
  background-color: blue
}