我对CSS很新，所以如果有人可以帮助我，我会非常感激！ 我需要制作一个不会下降的下拉菜单，因为导航栏位于页面底部。
以下是导航栏的CSS
* 5. Navigation *
************************************************/
#navigation {
background: #000000;
height: 30px;
width: 100%;
font-size: 0.8em;
font-family: Arial, Helvetica, sans-serif;
font-style: normal;
color: #666666;
font-weight: normal;
margin: 0px auto 1px;
padding: 0px 0px 0px 0px;
position: relative;
z-index: 9;
}
/*** ESSENTIAL STYLES ***/
.menu, .menu * {
margin: 0;
padding: 0;
list-style: none;
}
.menu {
line-height: 1.0;
}
.menu ul {
margin: 0px;
padding: 0px;
}
.menu ul ul, ul.menu ul {
position: absolute;
top: -9999px;
width: 180px; /* left offset of submenus need to match (see below) */
}
.menu ul li ul li, ul.menu ul li {
width: 100%;
border: none;
margin: 0px 0px 0px 0px;
}
.menu li:hover {
visibility: inherit; /* fixes IE7 'sticky bug' */
}
.menu li {
float: left;
position: relative;
}
.menu a {
display: block;
position: relative;
}
.menu li:hover ul,
.menu li.sfHover ul {
left: 0;
top: 30px; /* match top ul list item height */
z-index: 99;
}
ul.menu li:hover li ul,
ul.menu li.sfHover li ul {
top: -9999px;
}
ul.menu li li:hover ul,
ul.menu li li.sfHover ul {
left: 180px; /* match ul width */
top: 0;
}
ul.menu li li:hover li ul,
ul.menu li li.sfHover li ul {
top: -9999px;
}
ul.menu li li li:hover ul,
ul.menu li li li.sfHover ul {
left: 180px; /* match ul width */
top: 0;
}
/*** SKIN ***/
#navigation .menu .current_page_item a,
#navigation .menu .current_page_ancestor a,
#navigation .menu .current-menu-item a,
#navigation .menu .current-cat a {
background: #000000;
color: #FFFFFF;
}
#navigation .menu li .current_page_item a, #navigation .menu li .current_page_item a:hover,
#navigation .menu li .current-menu-item a, #navigation .menu li .current-menu-item a:hover,
#navigation .menu li .current-cat a, #navigation .menu li .current-cat a:hover {
background: #242424;
color: #FFFFFF;
}
#navigation .menu .current_page_item ul li a,
#navigation .menu .current-menu-item ul li a,
#navigation .menu .current-menu-ancestor ul li a,
#navigation .menu .current_page_ancestor ul li a,
#navigation .menu .current-cat ul li a {
background: #FFFFFF;
color: #333333;
}
#navigation .menu .current_page_item ul li a:hover,
#navigation .menu .current-menu-item ul li a:hover,
#navigation .menu .current-menu-ancestor ul li a:hover,
#navigation .menu .current_page_ancestor ul li a:hover,
#navigation .menu .current-menu-ancestor ul .current_page_item a,
#navigation .menu .current_page_ancestor ul .current-menu-item a,
#navigation .menu .current-cat ul li a:hover {
background: #F2F2F2;
color: #000000;
}
#navigation .menu .current_page_item .sub-menu a,
#navigation .menu .current_page_ancestor .sub-menu a,
#navigation .menu .current-menu-item .sub-menu a,
#navigation .menu .current-cat .sub-menu a {
background: #FFFFFF;
color: #333333;
}
#navigation .menu .current_page_item .sub-menu a:hover,
#navigation .menu .current_page_ancestor .sub-menu a:hover,
#navigation .menu .current-menu-item .sub-menu a:hover,
#navigation .menu .current-cat .sub-menu a:hover {
background: #F2F2F2;
color: #000000;
}
.menu {
float: left;
margin-bottom: 0;
}
.menu a {
background: #000000;
text-decoration: none;
font-style: normal;
font-weight: normal;
line-height: 30px;
margin: 0px 1px 0px 0px;
padding: 0px 10px 0px 10px;
}
.menu a, .menu a:link, .menu a:visited { /* visited pseudo selector so IE6 applies text colour*/
color: #999999;
}
.menu a:focus, .menu a:hover, .menu a:active {
background: #000000;
color: #FFFFFF;
outline: 0;
}
.menu li li a, .menu li li a:link, .menu li li a:visited {
background: #FFFFFF;
color: #666666;
margin: 0px;
padding: 0px 10px 0px 10px;
text-decoration: none;
text-transform: none;
text-shadow: none;
border: none;
}
.menu li li a:focus, .menu li li a:hover, .menu li li a:active {
background: #F2F2F2;
color: #333333;
border-bottom: none;
outline: 0;
}
.menu li.sfHover a {
background: #FFFFFF;
color: #333333;
}
.menu li {
margin: 0px;
}
.menu li li {
border: none;
}
.menu li:hover, .menu li.sfHover {
background: none;
border-bottom: none;
outline: 0;
}
.menu li li:hover, .menu li li.sfHover {
padding: 0px;
border: none;
outline: 0;
}
/*** ARROWS **/
.menu a.sf-with-ul {
padding-right: 25px;
min-width: 1px; /* trigger IE7 hasLayout so spans position accurately */
}
.sf-sub-indicator {
position: absolute;
display: block;
right: 10px;
top: 9px; /* IE6 only */
width: 10px;
height: 10px;
text-indent: -9999px;
overflow: hidden;
background: url(images/arrows-ffffff.png) no-repeat -10px -100px; /* 8-bit indexed alpha png. IE6 gets solid image only */
}
a > .sf-sub-indicator { /* give all except IE6 the correct values */
top: 9px;
background-position: 0 -100px; /* use translucent arrow for modern browsers*/
}
/* apply hovers to modern browsers */
a:focus > .sf-sub-indicator,
a:hover > .sf-sub-indicator,
a:active > .sf-sub-indicator,
li:hover > a > .sf-sub-indicator,
li.sfHover > a > .sf-sub-indicator {
background-position: -10px -100px; /* arrow hovers for modern browsers*/
}
/* point right for anchors in subs */
.menu ul ul .sf-sub-indicator, ul.menu ul .sf-sub-indicator {
background-position: -10px 0;
}
.menu ul ul a > .sf-sub-indicator, ul.menu ul a > .sf-sub-indicator {
top: 8px;
background-position: 0 0;
}
/* apply hovers to modern browsers */
.menu ul ul a:focus > .sf-sub-indicator,
.menu ul ul a:hover > .sf-sub-indicator,
.menu ul ul a:active > .sf-sub-indicator,
.menu ul ul li:hover > a > .sf-sub-indicator,
.menu ul ul li.sfHover > a > .sf-sub-indicator {
background-position: -10px 0; /* arrow hovers for modern browsers*/
}
/*** shadows for all but IE6 ***/
.sf-shadow ul ul {
background: none;
padding: 0 8px 9px 0;
-moz-border-radius-bottomleft: 17px;
-moz-border-radius-topright: 17px;
-webkit-border-top-right-radius: 17px;
-webkit-border-bottom-left-radius: 17px;
}
.sf-shadow ul.sf-shadow-off {
background: transparent;
}
答案 0 :(得分：0)
Here是一个包含3个向上扩展下拉的演示的帖子。他们甚至添加了一个jsFiddle：）
答案 1 :(得分：0)
你可以提供实时代码的链接，这样我就可以确切地看到它的设置，或者你也可以将html添加到你的问题中，然后我很乐意为你提供帮助。 同时，如果你只是一个简单的例子就是一个：Link to Drop up