我如何居中按鈕？

Question

我想要按鈕（聯繫人等）在導航欄的中間，嘗試了很多東西，但它只是不會成功。 任何幫助將是apreciated很多！

CSS：

#cssmenu ul, 
#cssmenu li, 
#cssmenu span, 
#cssmenu a { 
    margin: 0; 
    padding: 0; 
    position: relative; 
} 
#cssmenu { 
    height: 49px; 
    border-radius: 5px 5px 0 0; 
    -moz-border-radius: 5px 5px 0 0; 
    -webkit-border-radius: 5px 5px 0 0; 
    background: #141414; 
    background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAxCAIAAACUDVRzAA3NCSVQICAjb4U/gAAAALElEQVQImWMwMrJi+v//PxMDw3+m//8ZoPR/qBgDEhuXGLoeYswhXg8R5gAAdVpfoJ3dB5oAASUVORK5CYII=) 100% 100%; 
    background: -moz-linear-gradient(top, #32323a 0%, #141414 100%); 
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #32323a), color-stop(100%, #141414)); 
    background: -webkit-linear-gradient(top, #32323a 0%, #141414 100%); 
    background: -o-linear-gradient(top, #32323a 0%, #141414 100%); 
    background: -ms-linear-gradient(top, #32323a 0%, #141414 100%); 
    background: linear-gradient(to bottom, #32323a 0%, #141414 100%); 
    border-bottom: 2px solid #0fa1e0; 
} 
#cssmenu:after, 
#cssmenu ul:after { 
    content: ''; 
    display: block; 
    clear: both; 
} 
#cssmenu a { 
    background: #141414; 
    background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAxCAIAAACUDVRzAA3NCSVQICAjb4U/gAAAALElEQVQImWMwMrJi+v//PxMDw3+m//8ZoPR/qBgDEhuXGLoeYswhXg8R5gAAdVpfoJ3dB5oAASUVORK5CYII=) 100% 100%; 
    background: -moz-linear-gradient(top, #32323a 0%, #141414 100%); 
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #32323a), color-stop(100%, #141414)); 
    background: -webkit-linear-gradient(top, #32323a 0%, #141414 100%); 
    background: -o-linear-gradient(top, #32323a 0%, #141414 100%); 
    background: -ms-linear-gradient(top, #32323a 0%, #141414 100%); 
    background: linear-gradient(to bottom, #32323a 0%, #141414 100%); 
    color: #ff; 
    display: inline-block; 
    font-family: Helvetica, Arial, Verdana, sans-serif; 
    font-size: 12px; 
    line-height: 49px; 
    padding: 0 20px; 
    text-decoration: none; 
} 
#cssmenu ul { 
    list-style: none; 
} 
#cssmenu > ul { 
    float: left; 
} 
#cssmenu > ul > li { 
    float: left; 
} 
#cssmenu > ul > li:hover:after { 
    content: ''; 
    display: block; 
    width: 0; 
    height: 0; 
    position: absolute; 
    left: 50%; 
    bottom: 0; 
    border-left: 10px solid transparent; 
    border-right: 10px solid transparent; 
    border-bottom: 10px solid #0fa1e0; 
    margin-left: -10px; 
} 
#cssmenu > ul > li:first-child > a { 
    border-radius: 5px 0 0 0; 
    -moz-border-radius: 5px 0 0 0; 
    -webkit-border-radius: 5px 0 0 0; 
} 
#cssmenu > ul > li:last-child > a { 
    border-radius: 0 5px 0 0; 
    -moz-border-radius: 0 5px 0 0; 
    -webkit-border-radius: 0 5px 0 0; 
} 
#cssmenu > ul > li.active > a { 
    box-shadow: inset 0 0 3px black; 
    -moz-box-shadow: inset 0 0 3px black; 
    -webkit-box-shadow: inset 0 0 3px black; 
    background: #070707; 
    background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAxCAIAAACUDVRzAA3NCSVQICAjb4U/gAAAALklEQVQImWNQU9Nh+v//PxMDw3+m//8ZkNj/mRgYIHxy5f//Z0BSi18e2TwS5QG4MGB54HL+mAABJRU5ErkJggg==) 100% 100%; 
    background: -moz-linear-gradient(top, #26262c 0%, #070707 100%); 
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #26262c), color-stop(100%, #070707)); 
    background: -webkit-linear-gradient(top, #26262c 0%, #070707 100%); 
    background: -o-linear-gradient(top, #26262c 0%, #070707 100%); 
    background: -ms-linear-gradient(top, #26262c 0%, #070707 100%); 
    background: linear-gradient(to bottom, #26262c 0%, #070707 100%); 
} 
#cssmenu > ul > li:hover > a { 
    background: #070707; 
    background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAxCAIAAACUDVRzAA3NCSVQICAjb4U/gAAAALklEQVQImWNQU9Nh+v//PxMDw3+m//8ZkNj/mRgYIHxy5f//Z0BSi18e2TwS5QG4MGB54HL+mAABJRU5ErkJggg==) 100% 100%; 
    background: -moz-linear-gradient(top, #26262c 0%, #070707 100%); 
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #26262c), color-stop(100%, #070707)); 
    background: -webkit-linear-gradient(top, #26262c 0%, #070707 100%); 
    background: -o-linear-gradient(top, #26262c 0%, #070707 100%); 
    background: -ms-linear-gradient(top, #26262c 0%, #070707 100%); 
    background: linear-gradient(to bottom, #26262c 0%, #070707 100%); 
    box-shadow: inset 0 0 3px black; 
    -moz-box-shadow: inset 0 0 3px black; 
    -webkit-box-shadow: inset 0 0 3px black; 
} 
#cssmenu .has-sub { 
    z-index: 1; 
} 
#cssmenu .has-sub:hover > ul { 
    display: block; 
} 
#cssmenu .has-sub ul { 
    display: none; 
    position: absolute; 
    width: 200px; 
    top: 100%; 
    left: 0; 
} 
#cssmenu .has-sub ul li { 
    *margin-bottom: -1px; 
} 
#cssmenu .has-sub ul li a { 
    background: #0fa1e0; 
    border-bottom: 1px dotted #6fc7ec; 
    filter: none; 
    font-size: 11px; 
    display: block; 
    line-height: 120%; 
    padding: 10px; 
} 
#cssmenu .has-sub ul li:hover a { 
    background: #0c7fb0; 
} 
#cssmenu .has-sub .has-sub:hover > ul { 
    display: block; 
} 
#cssmenu .has-sub .has-sub ul { 
    display: none; 
    position: absolute; 
    left: 100%; 
    top: 0; 
} 
#cssmenu .has-sub .has-sub ul li a { 
    background: #0c7fb0; 
    border-bottom: 1px dotted #6db2d0; 
} 
#cssmenu .has-sub .has-sub ul li a:hover { 
    background: #095c80; 
} 

HTML：

<div id='cssmenu'> 
<ul> 
    <li class='active'><a href='index.html'><span>About</span></a></li> 
    <li><a href='#'><span>Bookings</span></a></li> 
    <li><a href='#'><span>Contact</span></a></li> 
    <li class='last'><a href='#'><span>Back to the Portal</span></a></li> 
</ul> 
</div> 

Answer 1

由於從koala_dev提醒，這裏的評論暗示變成爲答案。 :)

如果你希望你的中心環節，你可以使用：

ul { 
    text-align:center; 
} 
li { 
    display:inline-block; /* or even just inline */ 
} 

，如果你想居中UL沒有給寬度，你可以使用：

ul { 
    display:table; 
    margin:auto; 
} 
li { 
    /* use either float or display:inline/inline-block/table-cell/inline-table... any inline-level-box display*/ 
}