Edit in JSFiddle

<div class="box-set">
  <figure class="box box-1">Блок 1</figure>
  <figure class="box box-2">Блок 2</figure>
  <figure class="box box-3">Блок 3</figure>
  <figure class="box box-4">Блок 4</figure>
</div>

body {
  color: #fff;
  font: 600 14px/24px "Open Sans", "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", Sans-Serif;
}
.box-set,
.box {
  border-radius: 6px;
}
.box-set {
  background: #eaeaed;
  height: 160px;
  position: relative;
}
.box {
  background: #2db34a;
  border: 2px solid #ff7b29;
  height: 80px;
  line-height: 80px;
  position: absolute;
  text-align: center;
  width: 80px;
}
.box-1 {
  left: 10px;
  top: 10px;
}
.box-2 {
  bottom: 10px;
  left: 70px;
  z-index: 3;
}
.box-3 {
  left: 130px;
  top: 10px;
  z-index: 2;
}
.box-4 {
  bottom: 10px;
  left: 190px;
  z-index: 1;
}