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hover element below other element possibly hovered

I have a problem with my css.
i have some element generated by javascript and when i hover them i display another element but i don't know why, the new element displayed is below the others generated element...
this is my css about this problem:
.hiddenTextjob
{
display:none;
background-color:#000;
color:#FFF;
width:170px;
z-index:2!important;
height:55px;
}
.ghost_for:hover > .hiddenTextjob
{
display: block;
background-color:#000;
color:#FFF;
width:170px;
margin-top:-55px;
z-index:1!important;
}
.ghost_for
{
border: 0;
position:absolute;
background-color:blue;
z-index:1!important;
}
.hiddenTextjob is below ghost_for but he must be above...
Thanks by advance
[EDIT] here a jsfiddle to illustrate:
https://jsfiddle.net/95jtx2oL/
when you hover a blue element sometine the black hover is above sometime he is below that make me mad...

.ghost_for:hover {
z-index: 2!important;
}
The above code is enough to fix the issue ^^ jdfiddle
The issue was because of the stacking of HTML. The lower elements will be higher if they are on the same index. So if you can raise the z-index of the hovered element, it's child element will be higher as well.

It looks a bit strange that you set z-index to 1 here.
.ghost_for:hover > .hiddenTextjob
{
display: block;
background-color:#000;
color:#FFF;
width:170px;
margin-top:-55px;
z-index:1!important;
}
The initial value of 2 seems correct. Try to remove z-index from the above code or set it to 2.

I am unsure of your HTML but try this if it works for you:
.hiddenTextjob {
display: none;
background-color: #000;
color: #fff;
width: 170px;
z-index: 2 !important;
height: 55px;
}
.ghost_for:hover > .hiddenTextjob {
display: block;
background-color: #000;
color: #fff;
width: 170px;
margin-top: -55px;
}
.ghost_for {
border: 0;
position: absolute;
background-color: blue;
z-index: -1;
}

How to draw the line for list element from the starting of div container?

The live example http://jsfiddle.net/vro0om/yhvnh/
I am trying to draw the line separating 2 li elemts in nested ul. But the line takes the width of the container ul and not the div containing the complete structure. In the mentioned example I have used nested ul but in my working using ng-repeat to obtain the same effect.
.unstyled {
padding-left: 24px;
}
.titleSeperator
{
background: black ;
margin-top: 0px;
margin-bottom: 0px;
height : 1px;
width:100%;
}

I think there is an easier way to do what you want.
First, remove all your .titleSeperator divs. Then, use the following CSS code for the parent ul:
ul.lines {
line-height: 1.4em;
background: linear-gradient(white 95%, black 5%);
background-size: 100% 1.4em;
background-origin: content-box;
}
The new fiddle : http://jsfiddle.net/yhvnh/2/
Some explanations for the CSS:
line-gradient allows to create a gradient starting with 95% of white and ending with 5% of black
background-size define the size of the gradient : width 100% and height 1.4em (should be the same as line-height)
background-origin specifies what the background-position property should be relative to

You can set position: relative; overflow: hidden; on topmost ul and make separators absolutely positioned
.titleSeperator {
background: black;
height : 1px;
width: 10000px;
position: absolute;
left: 0;
}
Demo: http://jsfiddle.net/yhvnh/3/
However Lucas proposed better approach, so use it if you can, you should avoid redundant HTML elements.
Variant 2
You can also use :before pseudo element instead of redundant .titleSeparator divs
.unstyled > li:before {
content:'';
background: black;
height : 1px;
width: 10000px;
position: absolute;
left: 0;
}
Demo: http://jsfiddle.net/yhvnh/4/

Bootstrap dropdown-menu z-index on dynamically generated containers

I am using Bootstrap 3 dropdown-menu inside a dynamically generated container. The dropdown-menu appears behind the newly generated elements. See image reference.
container item position: relative; z-index: 1;
dropdown-menu position: absolute; z-index: 10000;
I also did test btn-group with a higher z-index and it did not work.
Here is a working fiddle http://jsfiddle.net/sGem8/

You don't need to add z-index property.. Simply remove it and it will work..
i.e.
#container > li {
display: block;
border-radius: 3px;
position: relative;
padding: 15px;
background: #ecf0f1;
margin-bottom: 15px;
}
Working Fiddle

I have faced the same issue.
Inside the main container which had all the nav-items, I had every outermost div items as position: relative
Only the dropdown menu had position: absolute
To make the dropdown appear above all items, add
.dropdown{
position: absolute;
z-index : 999; //some high value
}
and other items in the container have
.outer-divs{
position: relative;
z-index: 1; //some low value
}
If you still find your dropdown to behave not as expected,
try setting the div item that opens the dropdown when clicked to
.dropdown-container{
position :static;
}
Most people will find the last trick to be the most valuable.
Hope this helps.

Modify the below css in your styles
#container > li {
display: block;
border-radius: 3px;
position: relative;
/* z-index: 0; */
padding: 15px;
background: #ecf0f1;
margin-bottom: 15px;
}

Adding icon using css :before

I'm using superfish menu for the WordPress. I want to add some margin between the menu parent item and its dropdown and want to add an icon on the top of the drop down, so that it looks like following image:
The menu markup is automatically generated by the WordPress so it cannot be changed. I'm trying following CSS but it does not seem to work:
ul > li ul.subs{
margin-top: 10px;
}
ul > li ul.subs:before{
content: " ";
display: block;
height: 10px;
width: 20px;
position: absolute;
top: 0;
background: url('http://i.imgur.com/NL4Rq2S.png') no-repeat center bottom;
}
Problems:
When I hover, the sub menu disappears
The arrow icon does not appear.
Demo:
http://jsfiddle.net/y9Rk9/

The solution for the problem 2 is change the :before position to relative
The solution for the problem 1 is to make the menu height higher
ul > li ul.subs{
padding-top: 10px;
}
ul > li ul.subs::before{
content: " ";
display: block;
height: 10px;
width: 20px;
position: relative;
top: 0;
background: url('http://i.imgur.com/NL4Rq2S.png') no-repeat center bottom;
}
http://jsfiddle.net/y9Rk9/11/

Use ul > li ul.subs {padding-top: 10px;} instead margin-top: 10px;
A fiddle.

How to get a tree in HTML using pure CSS

I am trying to follow this tutorial and here's my code so far.
The end of the tutorial shows that the last nodes in a branch won't have any vertical bars after it. But I couldn't get it working that way!. Any ideas if I am doing something wrong, or maybe the tutorial is missing something!
I tried even the :last-child pseudo class as shown in the tutorial, but got the same result.

Here's a try using only pseudo-elements and borders:
ul, li{
position: relative;
}
/* chop off overflowing lines */
ul{
overflow: hidden;
}
li::before, li::after{
content: '';
position: absolute;
left: 0;
}
/* horizontal line on inner list items */
li::before{
border-top: 1px solid #333;
top: 10px;
width: 10px;
height: 0;
}
/* vertical line on list items */
li::after{
border-left: 1px solid #333;
height: 100%;
width: 0px;
top: -10px;
}
/* lower line on list items from the first level
because they don't have parents */
.tree > li::after{
top: 10px;
}
/* hide line from the last of the first level list items */
.tree > li:last-child::after{
display:none;
}
demo (edited)

Sadly, the pseudo-class is defined in the upcoming CSS3 specification and at the moment few web browsers support it.
It's written at the end of the tutorial. Maybe that's the reason it's not working.

I believe I've fixed it: https://github.com/gurjeet/CSSTree/pull/1
I modified the CSS to remove the background and changed margin to padding.
ul.tree, ul.tree ul {
list-style-type: none;
margin:0;
padding:0;
}
ul.tree ul {
padding-left: 1em;
background: url(vline.png) repeat-y;
}
ul.tree li {
margin:0;
padding: 0 1.2em;
line-height: 20px;
background: url(node.png) no-repeat;
color: #369;
font-weight: bold;
}
/* The #fff color background is to hide the previous background image*/
ul.tree li.last {
background: #fff url(lastnode.png) no-repeat;
}
ul.tree ul:last-child {
background: none;
}

Thank you guys, helpful answers which made me read some more, and finally I read this article and removed all dependency on JavaScript, and used the nth-last-of-type pseudo-selector to apply the special background to the last li items in a list (ignoring the ul that comes after the last li).
The final code is here. I am going to accept my own answer, unless someone points out some problem with it. (I don't think compatibility with older browsers matters to me at this stage.)
Thanks to #Aram for the answer. #OneTrickPony, your answer went over the head of this noob :) I am sure it does the right thing, but it's a bit too complicated for me.
<style type="text/css">
/* ul[class=tree] and every ul under it loses all alignment, and bullet
* style.
*/
ul.tree, ul.tree ul {
list-style-type: none;
margin:0;
padding:0;
}
/* Every ul under ul[class=tree] gets an indent of 1em, and a background
* image (vertical line) applied to all nodes under it (repeat-y)
*/
ul.tree ul {
padding-left: 1em;
background: url(vline.png) repeat-y;
}
/* ... except the last ul child in every ul; so no vertical lines for
* the children of the last ul
*/
ul.tree ul:last-child {
background: none;
}
/* Every li under ul[class=tree]
* - gets styling to make it bold and blue, and indented.
* - gets a background image (tilted T), to denote that its a node
* - sets height to match the height of background image
*/
ul.tree li {
margin:0;
padding: 0 1.2em;
background: url(node.png) no-repeat;
line-height: 20px;
color: #369;
font-weight: bold;
}
/* The last li gets a different background image to denote it as the
* end of branch
*/
ul.tree li:nth-last-of-type(1) {
background: url(lastnode.png) no-repeat;
}