.btn{display:inline-block;font-size:15px;text-align:center;border:none;vertical-align:middle;cursor:pointer;-moz-transition:all .15s ease 0s;-webkit-transition:all .15s ease 0s;-o-transition:all .15s ease 0s;transition:all .15s ease 0s;}
.btn:active{-webkit-box-shadow:inset 0 3px 5px rgba(0,0,0,.125);box-shadow:inset 0 3px 5px rgba(0,0,0,.125);}
.btn[disabled]{background-color:#aaa;color:#777;}