#horizontal-style {
    display: table;
    width: 100%
}
#horizontal-style li {
    display: table-cell;
}
#horizontal-style a {
    display: block;
    border: 1px solid red;
    text-align: center;
    margin: 0 5px;
    background: #F5F5DC
}

/*
div {
    background: #FFFFFF
}*/