* {
  box-sizing: border-box;
}

body {
  width: 880px;
  margin: 20px auto;
  font-size: 18px;
}
body h1 {
  text-align: center;
  font-weight: bold;
  font-size: 50px;
}
body h2 {
  text-align: center;
  font-weight: bold;
  font-size: 30px;
  margin-top: 55px;
}
body table {
  width: 100%;
  margin: 10px auto;
  border: solid 1px black;
}
body table td {
  width: 25%;
  text-align: center;
  vertical-align: middle;
  height: 60px;
  border: solid 1px black;
}
body .return {
  text-align: center;
  font-size: 25px;
}