html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  font-family: sans-serif;
}

.content {
  line-height: 1.6em;
  margin: 0 auto;
  padding: 30px 0 50px;
  max-width: 50pc;
  padding: 0 2em;
  overflow: hidden;
}

h2 {
  font-size: 3em;
  font-weight: 300;
  margin: .5em 0 .3em;
  text-align: center;
  line-height: 1em;
}

input, textarea {
  border-radius: 4px;
  padding: .5em .6em;
  box-sizing: border-box;
  outline: none;
}

input {
  height: 36px;
  width: 20%;
  min-width: 140px;
  font-family: sans-serif;
  vertical-align: middle;
  line-height: normal;
  display: inline-block;
  white-space: nowrap;
  font-size: 100%;
  cursor: pointer;
  user-select: none;
  color: #fff;
  text-shadow: 0 1px 1px rgba(0,0,0,.2);
  text-align: center;
}

input:active {
  box-shadow: 0 0 0 1px rgba(0,0,0,.15) inset, 0 0 6px rgba(0,0,0,.2) inset;
}

.controls {
  margin: .5em 0 1em;
}

#clear {
  background: #009a3e;
}

#restart {
  float: right;
  background: #c01200;
}

#terminal {
  display: block;
  width: 100%;
  background: #222;
  height: 25pc;
  max-height: 60vh;
  color: #c9ea7b;
  font-family: Courier New, monospace;
  font-size: 80%;
  line-height: 110%;
  resize: none;
  box-shadow: inset 0 1px 3px #ddd;
  border: 1px solid #ccc;
}