* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', sans-serif;
  padding: 20px;
}

.block:hover > .tooltip {
  display:block;
}

.tooltip {
  display: none;
  position: absolute;
  background: #d0d0d0;
  padding: 3px 10px;
  border: 1px solid #000;
  left: 20px;
  top: 5px;
  z-index: 2;
  font-size: 16px;
  font-weight: normal;
}

.hide{
  display: none !important;
}
.f-l {
 float: left;
}

.mr20 {
  margin-right: 20px;
}

.w100 {
  width: 100%;
}

.w120 {
  width: 120px;
}

.h120 {
  height: 120px;
}

.t-center {
  text-align: center;
}

.t-right {
  text-align: right;
}

.green {
  background: #8bc34a !important;
}

.blue {
  background: #03a9f4 !important;
}

.red {
  background: #f44336 !important;
}

.orange {
  background: #ff9800 !important;
}

.yellow {
  background: #ffeb3b !important;
}

.white {
  background: #ffffff !important;
}

.side {
  width:  120px;
  height: 120px;
  float: left;
}

.block {
  width: 40px;
  height: 40px;
  background: #cecece;
  border: 1px solid #000;
  display: block;
  float: left;
  font-size: 24px;
  font-weight: bold;
  text-align: center;
  padding-top: 6px;
  position: relative;
}

.screen-2d {
  width: 100%;
  display: block;
  float: left;
  margin-top: 100px;
}

.screen-2d > div {
  float: left;
}

.screen-3d {
  width: 100%;
  display: block;
  float: left;
  margin-top: 100px;
}

.screen-3d .tooltip {
  display: none !important;
}

.screen-3d > .front {
  width: 400px;
}

.screen-3d > .back {
  margin-top: 60px;
}

.screen-3d > div {
  float: left;
}

.screen-3d  .U-2d {
  transform: skew(45deg);
  height: 60px;
  margin-bottom: -20px;
  margin-left: 100px;
}

.screen-3d  .U-2d .block {
  height: 20px;
  padding-top: 0;
  font-size: 18px;
}

.screen-3d  .L-2d {
  transform: skew(0,45deg);
  width: 60px;
  margin-top: -10px;
}

.screen-3d  .L-2d .block {
  width: 20px;
}

.screen-3d  .F-2d {
  margin-top: 20px;
  margin-left: -10px;
}

.screen-3d  .R-2d {
  transform: skew(0,-45deg);
  width: 60px;
  margin-top: 40px;
}

.screen-3d  .R-2d .block {
  width: 20px;
}

.screen-3d  .B-2d {
  margin-left: -10px;
}

.screen-3d  .D-2d {
  transform: skew(-45deg);
  height: 60px;
  margin-top: -10px;
  margin-left: -40px;
}

.screen-3d  .D-2d .block {
  height: 20px;
  padding-top: 0;
  font-size: 18px;
}

.w100 > div {
  float: left;
  margin: 10px;
}

.menu > button {
  padding: 20px;
}