body {
  background-color: #f7f7f0;
  margin: 0;
  font-family: sans-serif;
  text-align: center;
}

input {
  height: 1.5rem;
  font-size: 1.1rem;
  width: 4rem;
}

#face {
  border: 2px solid #808080;
  border-left-color: #fff;
  border-top-color: #fff;
  width: 21px;
  height: 21px;
  cursor: pointer;
}

#face:active {
  border: 2px solid #808080;
  border-bottom: 1px solid #808080;
  border-right: 1px solid #808080;
}

table {
  border-collapse: collapse;
  margin: 0 auto;
}

.pad {
  border: 2px solid #808080;
  border-right-color: #fff;
  border-bottom-color: #fff;
}

.game-container {
  margin-top: 0.8rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.intro-text {
  margin-top: 0.8rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.difficulty-links {
  margin-top: 0.8rem;
}

.difficulty-links a {
  margin: 0 5px;
  cursor: pointer;
  color: blue;
  text-decoration: underline;
}

.game-board {
  margin-top: 0.8rem;
  border-radius: 6px;
  background: #cccccc;
  display: inline-block;
  padding: 9px;
}

.header-panel {
  height: 34px;
  width: 100%;
}

.canvas-container {
  margin-top: 6px;
}