styles.css

* {
  margin: 0px;
  padding: 0px;
}
body {
  background-color: #e2e2e2;
}
header {
  background-color: #b7b7b7;
}
h1 {
  color: #cecece;
  font-family: 'Roboto', sans-serif;
  padding: 20px 0px 20px 90px;
  /*font-family: 'Karla', sans-serif;*/
  /*font-family: 'Questrial', sans-serif;*/
}
main {
  height: 100%;
}
.interface {
  padding: 5px;
  background-color: #b7b7b7;
}
button {
  background-color: #e2e2e2;
  font-family: 'Roboto', sans-serif;
  text-transform: uppercase;
  border-style: none;
  padding: 2px;
  margin: 10px 0px 10px 89px;
}
#palette {
  margin: 10px 0px 10px 89px;
  position: absolute;
  right: 20px;
  bottom: 20px;
}
#palette > div {
  display: inline-block;
  width: 50px;
  height: 50px;
}
canvas {
  padding: 50px;
  background-position: center;
  background-repeat: no-repeat;
  /*background-image: url(img/pencil-throbber.gif);*/
}
.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}
.centre {
  display: block;
  margin: auto;
}