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From 2012.igem.org

1. cssmenu ul { margin: 0; padding: 0;}
2. cssmenu li { margin: 0; padding: 0;}
3. cssmenu a { margin: 0; padding: 0;}
4. cssmenu ul {list-style: none;}
5. cssmenu a {text-decoration: none;}
6. cssmenu {height: 50px; background-color: rgb(35,35,35); box-shadow: 0px 2px 3px rgba(0,0,0,.4);}

1. cssmenu > ul > li {

   float: left;
   margin-left: 15px;
   position: relative;

}

1. cssmenu > ul > li > a {

   color: rgb(160,160,160);
   font-family: Verdana, 'Lucida Grande';
   font-size: 15px;
   line-height: 50px;
   padding: 5px 5px;

-webkit-transition: color .15s;

  -moz-transition: color .15s;
    -o-transition: color .15s;
       transition: color .15s;

}

1. cssmenu > ul > li > a:hover {color: rgb(250,250,250); }

1. cssmenu > ul > li > ul {

   opacity: 0;
   visibility: hidden;
   padding: 16px 0 20px 0;
   background-color: rgb(250,250,250);
   text-align: left;
   position: absolute;
   top: 55px;
   left: 50%;
   margin-left: -90px;
   width: 180px;

-webkit-transition: all .3s .1s;

  -moz-transition: all .3s .1s;
    -o-transition: all .3s .1s;
       transition: all .3s .1s;

-webkit-border-radius: 5px;

  -moz-border-radius: 5px;
       border-radius: 5px;

-webkit-box-shadow: 0px 1px 3px rgba(0,0,0,.4);

  -moz-box-shadow: 0px 1px 3px rgba(0,0,0,.4);
       box-shadow: 0px 1px 3px rgba(0,0,0,.4);
  z-index : 100;

}

1. cssmenu > ul > li:hover > ul {

   opacity: 1;
   top: 65px;
   visibility: visible;
   z-index : 100;

}

1. cssmenu > ul > li > ul:before{

   content: ;
   display: block;
   border-color: transparent transparent rgb(250,250,250) transparent;
   border-style: solid;
   border-width: 10px;
   position: absolute;
   top: -20px;
   left: 50%;
   margin-left: -10px;

}

1. cssmenu > ul ul > li { position: relative;}

1. cssmenu ul ul a{

   color: rgb(50,50,50);
   font-family: Verdana, 'Lucida Grande';
   font-size: 13px;
   background-color: rgb(250,250,250);
   padding: 5px 8px 7px 16px;
   display: block;

-webkit-transition: background-color .1s;

  -moz-transition: background-color .1s;
    -o-transition: background-color .1s;
       transition: background-color .1s;

}

1. cssmenu ul ul a:hover {background-color: rgb(240,240,240);}

1. cssmenu ul ul ul {

   visibility: hidden;
   opacity: 0;
   position: absolute;
   top: -16px;
   left: 206px;
   padding: 16px 0 20px 0;
   background-color: rgb(250,250,250);
   text-align: left;
   width: 160px;

-webkit-transition: all .3s;

  -moz-transition: all .3s;
    -o-transition: all .3s;
       transition: all .3s;

-webkit-border-radius: 5px;

  -moz-border-radius: 5px;
       border-radius: 5px;

-webkit-box-shadow: 0px 1px 3px rgba(0,0,0,.4);

  -moz-box-shadow: 0px 1px 3px rgba(0,0,0,.4);
       box-shadow: 0px 1px 3px rgba(0,0,0,.4);

}

1. cssmenu ul ul > li:hover > ul { opacity: 1; left: 196px; visibility: visible;}

1. cssmenu ul ul a:hover{

   background-color: rgb(205,44,36);
   color: rgb(240,240,240);

}