Lifted shadows

new_gist_file

.lifted-box {
  position: relative;
  z-index: 1;
}
.lifted {
  display: block;
  position: relative;
}
.lifted:before,
.lifted:after {
  position: absolute;
  content: '';
  z-index: -1;
  left: 12px;
  bottom: 10px;
  width: 70%;
  max-width: 180px; /* avoid rotation causing ugly appearance at large container widths */
  max-height: 100px;
  height: 55%;
  box-shadow: 0 10px 8px rgba(0, 0, 0, 0.35);
  -webkit-transform: skew(-15deg) rotate(-6deg);
  -moz-transform: skew(-15deg) rotate(-6deg);
  -ms-transform: skew(-15deg) rotate(-6deg);
  -o-transform: skew(-15deg) rotate(-6deg);
  transform: skew(-15deg) rotate(-6deg);
}
.lifted:after {
  right: 12px;
  left: auto;
  -webkit-transform: skew(15deg) rotate(6deg);
  -moz-transform: skew(15deg) rotate(6deg);
  -ms-transform: skew(15deg) rotate(6deg);
  -o-transform: skew(15deg) rotate(6deg);
  transform: skew(15deg) rotate(6deg);
}