h1 { font-size: 1.5em; }

#demos {
  border-collapse: collapse;
  margin: 1em 0;
  border-bottom: 0.1em solid black;
}

#demos h1 { margin: 0; }

#demos th {
  border: 0.1em solid black;
  border-width: 0.1em 0;
  padding: 0.4em;
  background: #ffd;
}

#demos td {
  border-bottom: 0.05em solid gray;
  padding: 0.4em;
}