table,
th,
td {
    border: 1px solid black;
}

menu {
    padding: 0;
    margin: 0;
    list-style-type: none;
}

menu li button {
    display: block;
    float: left;
    width: 100px;
    background-color: #6495ED;
    color: black;
    text-decoration: none;
    text-align: center;
    padding: 5px;
    border: 2px solid;
    /*pour avoir un effet "outset" avec IE :*/
    border-color: #DCDCDC #696969 #696969 #DCDCDC;
}

menu li button:hover {
    background-color: #D3D3D3;
    border-color: #696969 #DCDCDC #DCDCDC #696969;
}