CSS3: Angled Drop Shadows

CSS3 Shadow

div {
  background: rgba(255,255,255,1);
  margin: 0 auto;
  width: 200px;
  padding: 100px;
  text-align: center;
  position: relative;
}

.shadow::before, .shadow::after {
  content: "";
  z-index:-1;
  position: absolute;
  width: 50%;
  height: 30px;
  bottom: 10px;
  box-shadow: 0 10px 14px rgba(0,0,0,0.75);
  -webkit-transform: skew(-4deg) rotate(-4deg);
  -moz-transform: skew(-4deg) rotate(-4deg);
  transform: skew(-4deg) rotate(-4deg);
}

.shadow::before {
  left: 12px;
}

.shadow::after {
  -webkit-transform: skew(4deg) rotate(4deg);
  -moz-transform: skew(4deg) rotate(4deg);
  transform: skew(4deg) rotate(4deg);
  right: 12px;
}

HTML Shadow

<div class="shadow">Hello World!</div>