a:active,
a:focus {
outline: none;
}

.boton {
width: 5em;
border: solid 1px #111;
}

.boton a {
display: block;
text-decoration: none;
text-align: center;
padding: 5px;
background: #3b678f;
color: #fff;
border-top: solid 1px #aaa;
border-left: solid 1px #aaa;
}

.boton a:hover {
background: #2c74b5;
}

.boton a:active {
border-top: solid 1px #111;
border-left: solid 1px #111;
padding: 4px 2px 2px 4px;
}