Drop-down menu that opens up/upward with pure css

问题:

I've created a dropdown menu with pure CSS and I've gotten it to a place that I like except I want it to be "drop-up" not "drop-down" since the menu bar is going at the bottom of the layout. What I need to add or change to make it "drop-up"?

#menu * { 
  padding:0; 
  margin: 0; 
  font: 12px georgia; 
  list-style-type:none;
}
#menu { 
  margin-top: 100px;
  float: left;
  line-height: 10px; 
  left: 200px;
}
#menu a { 
  display: block; 
  text-decoration: none; 
  color: #3B5330;
}
#menu a:hover { background: #B0BD97;}
#menu ul li ul li a:hover { 
  background: #ECF1E7; 
  padding-left:9px;
  border-left: solid 1px #000;
}
#menu ul li ul li {
  width: 140px; 
  border: none; 
  color: #B0BD97;  
  padding-top: 3px; 
  padding-bottom:3px; 
  padding-left: 3px; 
  padding-right: 3px; 
  background: #B0BD97;
}
#menu ul li ul li a { 
  font: 11px arial; 
  font-weight:normal; 
  font-variant: small-caps; 
  padding-top:3px; 
  padding-bottom:3px;
}
#menu ul li {
  float: left; 
  width: 146px; 
  font-weight: bold; 
  border-top: solid 1px #283923; 
  border-bottom: solid 1px #283923; 
  background: #979E71;
}
#menu ul li a { 
  font-weight: bold;
  padding: 15px 10px;
}
#menu li {
  position:relative; 
  float:left;
}
#menu ul li ul, #menu:hover ul li ul, #menu:hover ul li:hover ul li ul {
  display:none;
  list-style-type:none;
  width: 140px;
}
#menu:hover ul, #menu:hover ul li:hover ul, #menu:hover ul li:hover ul li:hover ul {
  display:block;
}
#menu:hover ul li:hover ul li:hover ul {
  position: absolute;
  margin-left: 145px;
  margin-top: -22px;
  font: 10px;
}
#menu:hover ul li:hover ul {
  position: absolute;
  margin-top: 1px;
  font: 10px;
}

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回答1:

Add bottom:100% to your #menu:hover ul li:hover ul rule

Demo 1

#menu:hover ul li:hover ul {
    position: absolute;
    margin-top: 1px;
    font: 10px;
    bottom: 100%; /* added this attribute */
}

---

Or better yet to prevent the submenus from having the same effect, just add this rule

Demo 2

#menu>ul>li:hover>ul { 
    bottom:100%;
}

---

Demo 3

source: http://jsfiddle.net/W5FWW/4/

And to get back the border you can add the following attribute

#menu>ul>li:hover>ul { 
    bottom:100%;
    border-bottom: 1px solid transparent
}