body {
  width: 85%;
  font-family: Monospace;
  text-align: center;
  margin: auto;
  background: linear-gradient(90deg, #800, #F00);
  color: #FFF;
}

button, input, textarea, canvas {
  position: relative;
  font-family: Monospace;
  color: #FFF;
  border: 2px solid #FFF;
}
button, input, textarea {
  background-color: #800;
}
button {
  font-size: 2em;
  margin: 8px;
}
button:disabled {
  opacity: 0.5;
}
textarea {
  width: 90%;
}

button:active, input:active, textarea:active {
  top: 1px;
}