<div id="holder">

<div class="button">
    <p class="btnText">READY?</p>
    <div class="btnTwo">
      <p class="btnText2">GO!</p>
    </div>
 </div>

<div class="button">
    <p class="btnText">CANCEL</p>
    <div class="btnTwo">
      <p class="btnText2">X</p>
    </div>
 </div>

</div>
@import url(https://fonts.googleapis.com/css?family=Roboto:700);
html, body{background : #FBC02D; font-family : Roboto; height: 100%; width: 100%; margin: 0;}

#holder{
  -moz-user-select: -moz-none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  background: white;
  padding: 10px;
  width: 250px;
  margin: 0 auto;
  position: relative;
  top: 50%;
  transform: translateY(-65%);
  box-shadow: 0px 3px 8px rgba(0,0,0,0.25);
  border-radius: 2px;
}
.button {
  background: #3D4C53;
  margin : 20px auto;
  width : 200px;
  height : 50px;
  overflow: hidden;
  text-align : center;
  transition : .2s;
  cursor : pointer;
  border-radius: 3px;
  box-shadow: 0px 1px 2px rgba(0,0,0,.2);
}
.btnTwo {
  position : relative;
  width : 200px;
  height : 100px;
  margin-top: -100px;
  padding-top: 2px;
  background : #26A69A;
  left : -250px;
  transition : .3s;
}
.btnText {
  color : white;
  transition : .3s;
}
.btnText2 {
  margin-top : 63px;
  margin-right : -130px;
  color : #FFF;
}
.button:hover .btnTwo{ /*When hovering over .button change .btnTwo*/
  left: -130px;
}
.button:hover .btnText{ /*When hovering over .button change .btnText*/
  margin-left : 65px;
}
.button:active { /*Clicked and held*/
  box-shadow: 0px 5px 6px rgba(0,0,0,0.3);
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js