.menu {
  text-align: center;
}

.menu > p {
  display: inline;
}

.menu > p:not(:last-child) {
  margin-right: 20px;
}

h2 {
  text-align: center;
  color: #333;
}

.main-header {
  background-color: #f4f4f4;
  padding: 20px 20px;
  text-align: center;
  border-bottom: 3px #cbcbcb solid;
  margin-bottom: 5px;
}

.intro {
  margin-left: 10px;
}

#section1 table {
  width: 100%;
  text-align: center;
  border-spacing: 0;
  border: 1px solid #ccc;
}

#section1 th,
#section1 td {
  padding: 5px;
  border: 1px solid #ccc;
}

#section1 thead tr {
  background-color: #efedef;
}

#section1 tfoot tr {
  background-color: #ddd;
}

.highlight {
  background-color: yellow;
  border: 1px #666 solid;
  padding: 10px;
}

#unique {
  color: #f00;
  font-size: 24px;
  font-weight: bold;
}

footer {
  text-align: center;
  color: white;
  padding: 10px;
  background-color: #333;
}