.rbutton:{opacity: 1;}
.rbutton:hover{opacity: 0.8;}
.rbutton:active{opacity: 0.4;}

.rbutton{
-webkit-box-shadow: 0px 17px 8px -14px rgba(0,0,0,0.75);
-moz-box-shadow: 0px 17px 8px -14px rgba(0,0,0,0.75);
box-shadow: 0px 17px 8px -14px rgba(0,0,0,0.75);
}

.rbutton:active{
    -moz-box-shadow: none;
    -webkit-box-shadow: none;
    box-shadow: none;
}