z-index

by nabendu

HTML

<div class="a">A</div> 
<div class="b">B</div>
<div class="c">C</div>
<div class="d">D</div>

CSS

.a ,.b, .c, .d {
  width:100px;
  height: 100px;
  position: absolute;
  top:0;
}

.a {background: red;}
.b {background: aqua; left: 5px; z-index: 2}
.c {background: green; left: 10px; z-index: 1}
.d {background: yellow; left: 15px}