html,
body {
  margin: 0;
  padding: 0;
  font-family: "Tahoma";
}
body {
  perspective: 3500px;
  perspective-origin: -500px -1000px;
}
h1,
h2,
h3,
h4,
h5,
h6,
ul,
li,
a,
span,
div,
p {
  margin: 0;
  padding: 0;
  font-family: "Tahoma";
  text-decoration: none;
  list-style: none;
  font-size: 14px;
  color: #000;
  font-weight: normal;
}
.btn-panel {
  margin: 100px auto;
  text-align: center;
}
.btn-panel .btn {
  display: inline-block;
  background-color: #000;
  color: #fff;
  border-radius: 2px;
  padding: 10px 20px;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
}
.box {
  cursor: pointer;
  transform-style: preserve-3d;
  height: 250px;
  width: 250px;
  margin: 100px auto;
  position: relative;
}
.box .side {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background-image: url(../img//texture.jpg);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  padding: 25px;
  box-sizing: border-box;
}
.box .side.front {
  transform: translateZ(125px);
}
.box .side.back {
  transform: translateZ(-125px);
}
.box .side.up {
  transform: translateY(-125px) rotateX(90deg);
}
.box .side.down {
  transform: translateY(125px) rotateX(90deg);
}
.box .side.left {
  transform: translateX(-125px) rotateY(-90deg);
}
.box .side.right {
  transform: translateX(125px) rotateY(90deg);
}