piskel/src/css/cheatsheet.css

.cheatsheet-link {
  position: fixed;
  bottom: 10px;
  left: 10px;

  padding: 1px 0 0 45px;
  color : gold;
  font-weight: bold;
  font-size : 1.25em;
  line-height: 20px;

  cursor : pointer;

  background-image:url('../img/keyboard.png');
  background-size:35px 20px;
  background-repeat:no-repeat;
  opacity: 0.5;
  z-index: 11000;
  transition : opacity 0.3s;
}

.cheatsheet-link:hover {
  opacity: 1;
}

#cheatsheet-wrapper {
  position: absolute;
  z-index: 10000;

  top: 0;
  right: 0;
  bottom: 0;
  left: 0;

  padding: 50px;

  box-sizing: border-box;
  -moz-box-sizing : border-box;

  color: white;
}

.cheatsheet-container {
  width: 100%;
  height:  100%;

  box-sizing: border-box;
  -moz-box-sizing : border-box;

  padding: 20px 3%;
  border-radius: 3px;
  background: rgba(0,0,0,0.9);
  overflow: auto;
}

.cheatsheet-container h3 {
  font-size:24px;
  margin-top: 0;
}

.cheatsheet-section {
  float: left;
  width : 33%;
}

.cheatsheet-shortcut {
  overflow: hidden;
  margin: 10px 0;
}

.cheatsheet-icon.tool-icon {
  float: left;
  display: inline-block;

  height: 30px;
  width: 30px;
  margin: 0 20px 0 0;

  background-size: 20px 20px;
  background-position: 5px 5px;
}

.cheatsheet-description {
  font-family:Courier;
  color: white;
  font-size : 13px;
  margin-left: 20px;
  line-height : 30px;
}

.cheatsheet-key {
  display : inline-block;
  height: 30px;
  line-height: 30px;
  padding: 0 10px;

  border : 1px solid gold;
  border-radius: 2px;

  box-sizing: border-box;
  -moz-box-sizing : border-box;

  text-align: center;
  font-family:Courier;
  font-weight: bold;
  font-size : 18px;
  color: gold;
}