How to put div over another

hey guys i have div that stand for the logo and i have another div that stand for a slide show. the slide show div is under the logo div and i want it to be under the it and behind it. this is what i have:

HTML

  <div id="site-container">
    <div id="header-container">
    <div id="logo"></div>
    </div>

    <div id="slide"></div>
    </div>

CSS

#logo {
   background:url(img/logo.png) no-repeat left top;
   width:259px;
   height:147px;
   float:left;
}

#slide {
   background:url(img/slide.png) no-repeat left top;
   width:776px;
   height:437px;
   float:left;
}

i tried to use z position but it turns to be something i dont want it to. any why to make the logo div be a top layer without moving its correct position?

thank you

---

If you want it over top of the div, you have to use z-index . You have to convert your #logo and #slide to have a position attribute and z-index should be applied to the div whose position you want to move up or down.

---

The corrected css is,

 #logo {
   background:url(img/logo.png) no-repeat left top;
   width:259px;
   height:147px;
   float:left;
   position:absolute;
   z-index:1000;
}

#slide {
   background:url(img/slide.png) no-repeat left top;
   width:776px;
   height:437px;
   float:left;
   position:relative;
   z-index:500;
}

The position of the slide div is set as relative and logo div is set as absolute. So the logo is placed within the slide.

The value of z-index attribute decides which one is under.

---

Try the following: CSS

  #Behind{
    width:100%;
    background-color:orange;
    position: absolute;
    z-index: -1;
    padding:50px;
   }
  #TopOne{ 
    position: absolute;
    top:70px;
    left:50px;
    background-color:wheat;
    padding:20px; 
    }

and the htm simply

    <div id="Behind"></div>
    <div id="TopOne">This is Just Testing :)</div>

This is the JSFiddle link also JSFiddle

链接地址: http://www.djcxy.com/p/75852.html

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