transparent border in menu with css

问题

I use a menu like below. How do I change the bottom-border from white to transparent so that the border appears as a transparent border. Now, when I set the border transparent, the entire menu is orange (background color of the menu):

ul#nav,
ul#nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
}
ul#nav li {
    position: relative;
    float: left;
    width: 118px;
}
#nav li ul {
    position: absolute;
    left: 0;
    top: auto;
    margin-left: -999em;
    border-top: 11px transparent;
}
#nav li  li {
    width: 135px;
    z-index: 1;
}
#nav li ul ul {
    position: absolute;
    left: 100%;
    top: -.1em;
    margin-left: -999em;
}
ul#nav li a {
    display: block;
    text-decoration: none;
    text-align: left;
    background: white;
    border: none;
}
* html ul#nav li a { height: 1% }
#nav li:hover a,
#nav li.over a,
#nav li:hover li:hover a,
#nav li.over li.over a,
#nav li:hover li:hover li:hover a,
#nav li.over li.over li.over a,
#nav li:hover li a:hover,
#nav li.over li a:hover,
#nav li:hover li:hover li:hover a:hover,
#nav li.over li li a:hover,
#nav li:hover li:hover li:hover li:hover a:hover,
#nav li.over li.over li.over li.over a:hover {
    color: #ff7f00;
    background-color: white;
}
#nav li:hover li a,
#nav li.over li a,
#nav li:hover li:hover li a,
#nav li.over li.over li a,
#nav li:hover li:hover li:hover li a,
#nav li.over li.over li.over li a {
    color: white;
    background: #ff7f00;
    margin-left: -10px;
    border-bottom: 1px solid #FFFFFF;
    filter: alpha(opacity=95);
    -moz-opacity: 0.95;
    opacity: 0.95;
}
#nav li ul li a { padding: 25px 7px 7px 7px }
ul#nav li:hover ul ul,
ul#nav li:hover ul ul ul,
ul#nav li.over ul ul,
ul#nav li.over ul ul ul { margin-left: -999em }
ul#nav li:hover ul,
ul#nav li li:hover ul,
ul#nav li li li:hover ul,
u#navl li li li li:hover ul,
ul#nav li.over ul,
ul#nav li li.over ul,
ul#nav li li li.over ul { margin-left: 0 }

回答1:

border-bottom:2px solid rgba(0,0,0,.5);

回答2:

this code is very difficult to read as it is presented. I presume you have tried border-bottom: 1px transparent; ?

回答3:

Simply use

border-bottom: none;

Demo

回答4:

Either use

border-bottom: none;

Or, if you still want to maintain a gap, simply set the colour to transparent:

border-bottom-color: transparent;

来源：https://stackoverflow.com/questions/11395663/transparent-border-in-menu-with-css

标签

css

border

transparent