.puzzle {
  margin: auto;
  margin-top: 10px;
  width: 927px;
  height: 579px;
  padding: 86px 34px 29px 54px;
  position: relative;
}

.canvas {
  height: 547px;
  width: 911px;
  position: relative;
}

.pieces ul {
  margin: 0px;
  padding: 0px;
  list-style-type: none;
}

.pieces li {
  float: left; 
  background: url(../images/puzzles/bussipeatus_active.png);
  height: 162px;
  width: 162px;
}

.pieces li.fixed {
  background: url(../images/puzzles/bussipeatus_fixed.png);
}

.button {
  position: absolute;
  font-size: 20px;
  color: #FFFFFF;
  background-color: #9fd468;
  border: 3px solid #5a9d31;
  border-radius: 10px;
  cursor: pointer;
  padding: 5px 15px;
  -webkit-box-shadow:  1px 1px 3px 2px rgba(0, 0, 0, 0.2);
  box-shadow:  1px 1px 3px 2px rgba(0, 0, 0, 0.2);
  text-shadow: 1px 1px 1px #8f8f8f;
}

.button:active {
  text-shadow: none;
  filter: none;
  margin: 1px 0px 0px 1px;
  -webkit-box-shadow:  none;
  box-shadow:  none;
}

.help-btn {
  top: 25px;
  left: 40px;
}

.preview-btn {
  top: 25px;
  left: 130px;
}