#code-checker #code-area {
  background-color: rgba(230, 255, 230, 0.3);
  border: 1px solid #cfc;
  padding: 10px;
  text-align: center;
  font-weight: 700;
}

#code-checker h1 {
  color: #000;
  margin-bottom: 1.5em;
}