我想知道,在这个例子中,菜单项和列表之间是如何存在间隙的。
这是演示的 CSS 代码
#colorNav > ul{
width: 450px; /* Increase when adding more menu items */
margin:0 auto;
}
#colorNav > ul > li{ /* will style only the top level li */
list-style: none;
box-shadow: 0 0 10px rgba(100, 100, 100, 0.2) inset,1px 1px 1px #CCC;
display: inline-block;
line-height: 1;
margin: 1px;
border-radius: 3px;
position:relative;
}
#colorNav > ul > li > a{
color:inherit;
text-decoration:none !important;
font-size:24px;
padding: 25px;
}
#colorNav li ul{
position:absolute;
list-style:none;
text-align:center;
width:180px;
left:50%;
margin-left:-90px;
top:70px;
font:bold 12px 'Open Sans Condensed', sans-serif;
/* This is important for the show/hide CSS animation */
max-height:0px;
overflow:hidden;
-webkit-transition:max-height 0.4s linear;
-moz-transition:max-height 0.4s linear;
transition:max-height 0.4s linear;
}
#colorNav li ul li{
background-color:#313131;
}
#colorNav li ul li a{
padding:12px;
color:#fff !important;
text-decoration:none !important;
display:block;
}
#colorNav li ul li:nth-child(odd){ /* zebra stripes */
background-color:#363636;
}
#colorNav li ul li:hover{
background-color:#444;
}
#colorNav li ul li:first-child{
border-radius:3px 3px 0 0;
margin-top:25px;
position:relative;
}
#colorNav li ul li:first-child:before{ /* the pointer tip */
content:'';
position:absolute;
width:1px;
height:1px;
border:5px solid transparent;
border-bottom-color:#313131;
left:50%;
top:-10px;
margin-left:-5px;
}
#colorNav li ul li:last-child{
border-bottom-left-radius:3px;
border-bottom-right-radius:3px;
}
/* This will trigger the CSS */
/* transition animation on hover */
#colorNav li:hover ul{
max-height:200px; /* Increase when adding more dropdown items */
}
这是链接: http ://demo.tutorialzine.com/2012/10/css3-dropdown-menu/