html,
body {
  background: lightblue;
}

#canvas {
    background: #fff;
    margin: 20px;
}

.help {
  width : 25%;
}
.lists {
  width : 10%;
}


.mainBlock {
  float: left;
  padding: 15px; 
}

.collapsible {
	display: block;
}

.content {
	display: none;
}