html - How can I make a Input with a span with :before pseudo class? -

it's firts question in stackoverflow ... have input type button, , want add pseudo:class before animation (http://codepen.io/anon/pen/emodkg). know it's impossible because input can't contain something. try add span input, span give class "btn" codepen ...

the problem span on input, have animation it's not clickable.

<span class="btn"><input type="button"></span> 

try one, think :)

.btn {    position: relative;    display: block;    margin: 30px auto;    padding: 20px;    overflow: hidden;    border-width: 0;    outline: none;    border-radius: 2px;    box-shadow: 0 1px 4px rgba(0, 0, 0, .6);    background-color: #2ecc71;    color: #ecf0f1;    transition: background-color .8s;    text-align: center;  }  .btn:hover,  .btn:focus {    background-color: #27ae60;  }  .btn:before {    content: "";    position: absolute;    top: 50%;    left: 50%;    display: block;    width: 0;    padding-top: 0;    border-radius: 100%;    background-color: rgba(236, 240, 241, .2);    -webkit-transform: translate(-50%, -50%);    -moz-transform: translate(-50%, -50%);    -ms-transform: translate(-50%, -50%);    -o-transform: translate(-50%, -50%);    transform: translate(-50%, -50%);  }  .btn:active:before {    width: 100%;    padding-top: 100%;    transition: width .1s ease-out, padding-top .1s ease-out;  }  .btn input {    display: none;  }

<label class="btn"><input type="button" />button</label>