html {
    font-family: Calibri, sans-serif;
    background-color: #4f4f4f;
    color: #f0f0f0;
}

body {
    margin: 20px;
}

details {
  margin-bottom: 1em;
  border-radius: 5px;
  overflow: hidden;
}

summary {
  font-weight: bold;
  cursor: pointer;
  font-size: 1.5em;
  padding: 0.75em 1em;
}

details > div {
  padding: 1em;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.75);
  margin: 0;
}