body {
  background-color: #ccc;
  margin: 0;
  padding: 0;
}

main {
  background-color: #fff;
  margin: auto;
  padding: 0 10px;
  max-width: 690px;
}

header, footer {
  text-align: center;
}

header {
  border-bottom: 2px solid #ccc;
}

footer {
  border-top: 2px solid #ccc;
}

h1, footer p {
  margin: 0;
  padding: 10px 0;
}

a {
  border-bottom: 1px solid #00c;
  color: #00c;
  text-decoration: none;
}

#form {
  text-align: center;
}

#prompt {
  box-sizing: border-box;
  padding: 8px;
  width: 100%;
}

#output-container {
  background-color: #eee;
  white-space: break-spaces;
}

.message-user {
  background-color: #700fb3;
  color: #eae7e7;
  font-weight: 700;
  padding: 8px;
}

details {
  border: 1px solid rgb(170, 170, 170);
  border-radius: 4px;
  padding: 0.5em 0.5em 0px;
  margin: 2px 0px;
}

summary {
  cursor: pointer;
  font-weight: 700;
  margin: -0.5em -0.5em 0px;
  padding: 0.5em;
}