a.boton1{ background:#ff0000; color:#ff9090; text-decoration:none; display:block; width:90px; text-align:center; margin:20px auto; padding:10px 10px; transition:all 0.3s; } 
a.boton1:hover{ 
   box-shadow:0px -5px 0 #088
    inset; 
    background-color: #ffff00;
    }