html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  margin: 0;
  background: #f3f2f2;
  color: rgb(12, 11, 11);
  font-family: sans-serif;
  text-align: center;
}
#heading-banner {
  width: 100%;
  padding: 20px 0;
  background: #000;
  text-align: center;
  


}
#heading-banner h1 {
    font-size: 60px;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    color: #f3f2f2
}

#text-box {
  width: 640px;
  max-width: 100%;
  margin: 20px auto;
  text-align: left;
  font-size: 18px;
}
#sketch-container {
  width: 640px;
  height: 480px;
  margin: 0 auto;
  position: relative;
}

#sketch-container canvas {
  width: 100%;
  height: 100%;
  display: block;
}