.button, .button:visited { /* botones genéricos */
background: #222 repeat-x;
display: inline-block;
padding: 5px 10px 6px;
color: #FFF;
text-decoration: none;
-moz-border-radius: 6px;
-webkit-border-radius: 6px;
-moz-box-shadow: 0 1px 3px rgba(0,0,0,0.6);
-webkit-box-shadow: 0 1px 3px rgba(0,0,0,0.6);
text-shadow: 0 -1px 1px rgba(0,0,0,0.25);
border-top: 0px;
border-left: 0px;
border-right: 0px;
border-bottom: 1px solid rgba(0,0,0,0.25);
position: relative;
cursor:pointer;
}

button::-moz-focus-inner,
input[type="reset"]::-moz-focus-inner,
input[type="button"]::-moz-focus-inner,
input[type="submit"]::-moz-focus-inner,
input[type="file"] > input[type="button"]::-moz-focus-inner {
border: none;
}

.button:hover { /* el efecto hover */
background-color: #111;
color: #FFF;
}

.button:active{ /* el efecto click */
top: 1px;
}

.button, .button:visited,.medium.button, .medium.button:visited {
font-size: 13px;
font-weight: bold;
line-height: 1;
text-shadow: 0 -1px 1px rgba(0,0,0,0.25);
}   

.yellow.button, .yellow.button:visited { background-color: #FFB515; }
.yellow.button:hover{ background-color: #FC9200; }