html, body {
  width: 100%;
  height: 100%;
}

body {
  background: #f0f0f0;
}

div {
  position: relative;
  width: 95%;
  max-width: 600px;
  margin: 1rem auto;
}
div::after {
  content: "";
  padding-bottom: 69%;
  display: block;
}
div canvas {
  position: absolute;
  top: 50%;
  left: 50%;
  height: auto;
  width: 100%;
  transform: translate(-50%, -50%);
}
div canvas#render {
  display: none;
}

section {
  width: 95%;
  margin: 1rem auto;
  max-width: 400px;
}
section a,
section input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  font-size: 0.8rem;
}
section a {
  padding: 0.6em 0.5em 0.5em;
  border: none;
  background: #121212;
  color: white;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}
section a:hover {
  opacity: 0.9;
}
section input {
  padding: 0.25em 0.5em;
  font-family: Times, sans-serif;
  letter-spacing: 0.025em;
  text-transform: uppercase;
  border: 1px solid #e9e9e9;
  text-align: center;
}
section input::-moz-placeholder {
  color: #ccc;
}
section input:-ms-input-placeholder {
  color: #ccc;
}
section input::placeholder {
  color: #ccc;
}
section input + * {
  margin-top: 0.5rem;
}