.itemArvore, .itemArvore:hover{
    background-color: #FFF;
    color: #3D51B9;
    font: 12px "MS Sans Serif";
    text-decoration: none;
}
.itemArvore:hover{
    color: #500;
}
span.caixaImg{
    width: 16px;
    margin-top: -2px;
}