a.buton{
    background:#2981E4;
    padding:5px 10px;
    text-decoration:none;
    color:#fff;
    font:bold 20px Arial, Helvetica, sans-serif;
    border-radius: 7px;
    box-shadow: 0 1px 2px #000;
    text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.25);
}
a.buton:hover{
    background-color:#006699;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.25);
}