#canvas.affix {
  top: 70px;
  position: fixed;
}
#canvas {
  background-color: white;
  height: 400px;
  border: 1px solid #999;
  border-radius: 5px;
  position: relative;
}

#canvas .description {
  color: #777;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: #EEE;
  border-top: 1px solid #999;
  border-bottom-left-radius: inherit;
  border-bottom-right-radius: inherit;
  padding: 5px;
}

#canvas.affix {
  width: 378px;
}

@media (min-width: 1200px) {
  #canvas.affix {
    width: 468px;
  }
}

@media (max-width: 979px) and (min-width: 768px) {
  #canvas.affix {
    width: 288px;
  }
}

@media (max-width: 767px) {
  #canvas.affix {
    top: 0;
    margin-bottom: 10px;
    position: relative;
    width: 100%;
  }
}