botón presionado CSS
button {
background: #ededed;
border: 1px solid #ccc;
padding: 10px 30px;
border-radius: 3px;
cursor: pointer;
}
button:active {
background: #e5e5e5;
-webkit-box-shadow: inset 0px 0px 5px #c1c1c1;
-moz-box-shadow: inset 0px 0px 5px #c1c1c1;
box-shadow: inset 0px 0px 5px #c1c1c1;
outline: none;
}
TheGreenKakapo