css - How to add a transition to a absolute positioned box on hover -

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hi have created boxes overflow: hidden, on hover box drop down showing inner box.

i have created , works fine use transition on effect smoothen drop down. have added transition , not working.

any advice great on thank you.

<html> <head> <title></title>  <style type="text/css"> #items {width:300px;} .item {width:100px;border:solid 1px #ccc;float:left;height:20px;  z-index:0;overflow:hidden;position:relative;}  .item:hover{overflow:visible;z-index:100;} .item:hover .inner{z-index: 100;} .inner{position: absolute;  background: white; width: 100%; } </style> </head> <body> <div id="items">  <div class="item"><div class="inner">text 1<br>text 1<br>text 1</div></div> <div class="item"><div class="inner">text 2<br>text 2<br>text 2</div></div> <div class="item"><div class="inner">text 3<br>text 3<br>text 3</div></div> <div class="item"><div class="inner">text 4<br>text 4<br>text 4</div></div> <div class="item"><div class="inner">text 5<br>text 5<br>text 5</div></div> <div class="item"><div class="inner">text 6<br>text 6<br>text 6</div></div> <div class="item"><div class="inner">text 7<br>text 7<br>text 7</div></div> <div class="item"><div class="inner">text 8<br>text 8<br>text 8</div></div> <div class="item"><div class="inner">text 9<br>text 9<br>text 9</div></div> <div class="item"><div class="inner">text 10<br>text 10<br>text 10</div></div>   </div> </body> </html>

you can build menu want css, you'll need better html structure. don't want rebuild wheel, got 1 (a simple one) done:

http://cssdeck.com/labs/pure-css3-smooth-drop-down-menu

html 

 <nav>         <ul class="cf">             <li><a href="#">menu item 1</a></li>             <li><a class="dropdown" href="#">menu item 2</a>                 <ul>                     <li><a href="#">sub-menu item 1</a></li>                     <li><a href="#">sub-menu item 2</a></li>                     <li><a href="#">sub-menu item 3</a></li>                 </ul>                 </li>             <li><a href="#">menu item 3</a></li>             <li><a href="#">menu item 4</a></li>         </ul>     </nav>

css

nav ul {     -webkit-font-smoothing:antialiased;     text-shadow:0 1px 0 #fff;     background: #ddd;     list-style: none;     margin: 0;     padding: 0;     width: 100%; } nav li {     float: left;     margin: 0;     padding: 0;     position: relative;     min-width: 25%; } nav {     background: #ddd;     color: #444;     display: block;     font: bold 16px/50px sans-serif;     padding: 0 25px;     text-align: center;     text-decoration: none;     -webkit-transition: .25s ease;        -moz-transition: .25s ease;         -ms-transition: .25s ease;          -o-transition: .25s ease;             transition: .25s ease; } nav .dropdown:after {     content: ' ▶'; } nav .dropdown:hover:after{     content:'\25bc' } nav li:hover {     background: #ccc; } nav li ul {     float: left;     left: 0;     opacity: 0;     position: absolute;     top: 35px;     visibility: hidden;     z-index: 1;     -webkit-transition: .25s ease;        -moz-transition: .25s ease;         -ms-transition: .25s ease;          -o-transition: .25s ease;             transition: .25s ease; } nav li:hover ul {     opacity: 1;     top: 50px;     visibility: visible; } nav li ul li {     float: none;     width: 100%; } nav li ul a:hover {     background: #bbb; }  /* clearfix */  .cf:after, .cf:before {     content:"";     display:table; } .cf:after {     clear:both; } .cf {     zoom:1; }​

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