styles.css

* {
  box-sizing: border-box;
}

body {
  background-color: #333;
  color: #5c616c;
  margin: 0;
  font-family: sans-serif;
}

canvas {
  display: block;
  margin: 0 auto;
  width: 100vh;
  height: 100vh;
}

h1 {
  font-size: 28px;
  font-weight: bold;
  line-height: 40px;
  margin: 4px 0;
}

a {
  color: #1875d1;
  cursor: pointer;
  font-weight: bold;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

label {
  cursor: pointer;
  display: inline-block;
  margin-right: 8px;
  padding: 9px 0;
}

input:not([type=radio]) {
  border: 2px solid black;
  background: white;
  color: black;
  border-radius: 2px;
  margin: 7px 0;
  height: 45px;
  padding: 0 10px;
  font-size: 14px;
  font-weight: bold;
  cursor: text;
  user-select: text;
  width: 100px;
}

input[type=button] {
  cursor: pointer;
}

input[type=button]:hover {
  background: #efefef;
}

hr {
  width: 50%;
  border: 3px solid #5c616c;
  background-color: #5c616c;
  border-radius: 4px;
}

#controls {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 1;
}

.paper {
  background-color: white;
  border-radius: 3px;
  box-shadow: 0 3px 8px 0 rgba(0, 0, 0, 0.6);
  line-height: 2em;
  padding: 8px 16px;
  text-align: center;
  width: 260px;
}