我的CSS导航菜单拒绝在浏览器中居中？

margin-right: auto

margin-left:auto

display: inline-block

.navigation {
    height: auto
    width: 96%;
    border-top-color: rgb(119,120,122);
    border-top-style: solid;
    border-top-width: 1px;
    border-bottom-color: rgb(119,120,122);
    border-bottom-style: solid;
    border-bottom-width: 1px;
    margin-top: 1%;
    margin-right: auto;
    margin-bottom: 1%;
    margin-left: auto;
    padding-top: 1%;
    padding-bottom: 1%;
    background-color: transparent;
    background-image: none;
}

ul {
    height: auto;
    overflow: hidden;
    margin-right: auto;
    margin-left: auto;
}

ul li {
    display: inline;
}

ul li ul {
    display: none;
}

ul li:hover ul {
    height: auto;
    width: 96%;
    display: block;
    position: absolute;
    margin-right: auto;
    margin-left: auto;
}

ul li a {
    display: inline-block;
    cursor: pointer;
    position: relative;
    margin-right: 0.15%;
    margin-bottom: -0.2%;
    padding-top: 1.25%;
    padding-right: 1.4%;
    padding-bottom: 1.25%;
    padding-left: 1.4%;
}

ul li:hover ul a {
    margin-right: -0.2%;
    margin-bottom: 0;
}