style.css

body {
  margin: 0;
  background: #061004;
  color: #747474;
  font-style: italic;
  font-size: 16px;
}

h1 {
  margin-top: 0;
  padding: 0 7% 0 0;
  text-align: right;
  border-bottom: dashed #747474 2px;
  font-variant: all-petite-caps;
  font-size: 24px;
}

.container {
  text-align: center;
}

.inputs, .buttons {
  margin: 6px 0 12px;
  text-align: center;
}

input[type=text] {
  width: 120px;
  padding: 3px;
  margin-right: 8px;
  background: black;
  color: #eee;
  border: solid 1px #747474;
}

button {
  color: #747474;
  background: black;
  border: solid 1px #300e96;
}

button:hover {
  border-color: 603ec6;
}

button:active {
  color: black;
  background: #747474;
  border: black;
}

canvas {
  width: 90%;
  margin: 10px;
  border: double 4px #300e96;
}

@media (min-width: 620px) {
  canvas {
    width: 42%;
  }
}