.WaGadgetMenuHorizontal .menuInner ul.firstLevel {
    text-align: center;
    width: 100%; /* Ensure it takes full width of its container */
}

.WaGadgetMenuHorizontal .menuInner ul.firstLevel > li {
    display: inline-block;
    float: none; /* Disable default floating if any */
    vertical-align: top; /* Align items nicely */
}