details.small {
  display: block;
  border: 0px solid silver;
  border-radius: 4px;
  padding: 0.8em;
}
details summary.small {
  margin: -.5em;
  padding: .5em;
color: #333333;
font-weight: normal;
}


details.small[open] > summary {
  margin-bottom: .5em;
  border-bottom: 1px solid silver;

}