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

body, textarea {
  color: #4d4d4d;
}

a {
  color: dodgerblue;
}
a:hover {
  color: #187ad7;
}

body {
  display: flex;
  justify-content: center;
}

h1 {
  font-size: 150%;
  color: dodgerblue;
  margin: 0;
  padding: 20px 0;
}

.app {
  max-width: 1000px;
  flex: 1;
  padding: 10px;
  display: flex;
  flex-direction: column;
}

.info {
  padding: 0 0 40px 0;
}

.playground {
  flex: 1;
  display: flex;
}

.column {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.separator {
  width: 20px;
}

label {
  font-weight: bold;
  margin-bottom: 10px;
}

textarea {
  width: 100%;
  flex: 1;
  border: 1px solid #bfbfbf;
  border-radius: 3px;
  padding: 5px;
  box-sizing: border-box;
  font-family: monospace;
  max-height: 500px;
}

textarea[readonly] {
  background: #f5f5f5;
}

.error {
  color: #f65252;
}