Button 29b 

<a class="Button29 slide_right" href="#">Button 29b</a>

/*-- Button 29b --*/
.Button29 {
  color: red;
  border: 2px solid rgb(216, 2, 134);
  border-radius: 0px;
  padding: 9px 37px;
  display: inline-block;
  font-family: "Lucida Console", Monaco, monospace;
  font-size: 14px;
  letter-spacing: 1px;
  cursor: pointer;
  box-shadow: inset 0 0 0 0 #D80286;
  -webkit-transition: ease-out 0.4s;
  -moz-transition: ease-out 0.4s;
  transition: ease-out 0.4s;
}

.slide_right:hover {
  box-shadow: inset 400px 0 0 0 #D80286;
}