A CodePen by Andreas Gillström. Telecast Hover - Idea from http://drbl.in/hDjU

index.html

<h4>TELECAST HOVER</h4>
<div class="kontainer">
  <div class="a"></div>
  <div class="b"></div>
  <div class="c"></div>
  <div class="d"></div>
  <div class="e"></div>
  <div class="f"></div>  
</div>

<p>Idea from <a href="http://drbl.in/hDjU">http://drbl.in/hDjU</a></p>

style.css

@import url(http://fonts.googleapis.com/css?family=Open+Sans);

*{
  margin: 0;
  padding: 0;
  font-family: Open sans;
  -webkit-font-smoothing: subpixel-antialiased;
  color: #007bb7;
  text-decoration: none;
  /*-webkit-backface-visibility: hidden;*/
}
body{
  background: #fbfbfb;  
}
h4{
  font-size: 2em;
  text-align: center;
  margin-top: 30px;
  text-shadow: -2px 2px 0px rgba(0,0,0,0.1);
}

p {
  font-size: 0.8em;
  position: fixed;
  bottom: 80px;
  left: 60px;
  text-align: center;
}

.kontainer {
  margin: 50px auto;
  width: 300px;
  border: 0px solid #fbfbfb;
}

.kontainer:before {
  content: '';
  background: #fbfbfb;
  height: 20px;
  width: 80px;
  position: absolute;
  z-index: 200;
  margin: 20px 0 0 110px;
}

.kontainer:after {
  content: '';
  background: #fbfbfb;
  height: 60px;
  width: 20px;
  position: absolute;
  z-index: 202;
  margin: -80px 0 0 140px;
}

.a, .b, .c, .d, .e, .f {
  position: relative;
  background: #fcbd10;
  height: 20px;
  width: 84px;
  box-shadow: -3px 4px 0px 0px rgba(0,0,0,0.1);
  
  -webkit-transition: all 0.5s ease;
  -moz-transition: all 0.5s ease;
  -o-transition: all 0.5s ease;
  transition: all 0.5s ease;
}

.a {
  border-radius: 15px 0 0 0;
}

.b{
  background: #f17722;
  width: 66px;
}

.c {
  background: #d71c23;
  width: 76px;
}

.d {
  background: #7f2980;
  width: 60px;
}

.e {
  background: #007bb7;
  width: 90px;
}

.f {
  background: #3cabe0;
  width: 80px;
  border-radius: 0 0 0 15px;
}

.kontainer:hover > .a,
.kontainer:hover > .b,
.kontainer:hover > .c,
.kontainer:hover > .d,
.kontainer:hover > .e,
.kontainer:hover > .f{
  width: 300px;
}

.kontainer:hover > .a{
  border-radius: 15px 15px 0 0;
}

.kontainer:hover > .f{
  border-radius: 0 0 15px 15px;
}