body {
  background-color: gainsboro;
}
em {
  color: red;
}
#first-div {
  margin-left: 20px;
}
#defaultCanvas0 {
  margin: 0px 20px;
  padding: 1px 1px;
  border: 5px blue solid;
}
button {
  margin-top: 20px;
  margin-left: 200px;
  width: 250px;
  height: 70px;
  font-size: 20px;
  color: blue;
  background-color: chartreuse;
  border: 2px green solid;
}
h3 {
  margin-left: 20px;
  color: crimson;
  font-size: 22px;
}