html,
body {
  height: 100%;
}
body,
h1 {
  margin: 0;
  font-family: Arial, sans-serif;
}
h1 {
  margin: 10px 0;
  color: navy;
}
body {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-pack: start;
  -webkit-justify-content: flex-start;
      -ms-flex-pack: start;
          justify-content: flex-start;
  -webkit-box-align: center;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
}
body dl {
  border: double;
  padding: 1em;
  display: block;
  width: 80%;
}
body dl + p {
  display: none;
}
body dl:empty {
  display: none;
}
body dl:empty + p {
  color: red;
  display: block;
}
body dl dt {
  font-family: fantasy, sans-serif;
  font-size: 1.5em;
  color: darkslateblue;
}
body dl dt:hover {
  color: red;
  cursor: pointer;
}
body dl dd {
  font-family: Verdana, sans-serif;
  margin: 0 0 10px 55px;
  font-size: 1em;
}
body form {
  background-color: darkslateblue;
  color: white;
  padding: 1em;
  width: 80%;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-justify-content: space-around;
      -ms-flex-pack: distribute;
          justify-content: space-around;
}
body form input,
body form button {
  margin: 0 1em;
  padding: .5em;
}
body form input:first-of-type {
  -webkit-box-flex: 1;
  -webkit-flex-grow: 1;
      -ms-flex-positive: 1;
          flex-grow: 1;
}
body form input:last-of-type {
  -webkit-box-flex: 4;
  -webkit-flex-grow: 4;
      -ms-flex-positive: 4;
          flex-grow: 4;
}
body form button {
  -webkit-box-flex: 1;
  -webkit-flex-grow: 1;
      -ms-flex-positive: 1;
          flex-grow: 1;
  background-color: transparent;
  outline: none;
  border: solid 1px;
  color: white;
}
body form button:hover {
  color: yellow;
}
