My website code is pretty standard
<div class="header"></div>
<div class="site-inner"></div>
<div class="footer"></div>
How can I achieve a header background like the one shown in the image? Do I need to set the entire site content to have position absolute and margin-top:-500px ?
Is that the only way to accomplish it?
When you mention overlap, I assume you are referring to the negative margin technique used in web design.
Negative margin is just one method that can be utilized to create overlapping elements on a webpage.
.header {
height: 60px;
background: lightgreen;
}
.content {
width: 90%;
margin: auto;
height: 60px;
background: lightgrey;
margin-top: -40px;
box-shadow: 0 -2px 2px darkgrey;
}<div class="header"></div>
<div class="content"></div>To achieve the desired effect, consider implementing the following CSS code:
.header{
width: 80%;
height: 75px;
margin: 0 auto;
margin-top: -20px;
background:#3A3A3A;
}
Consider the concept of positioning by referring to this resource: Positioning, and don't forget the importance of z-index as explained here: Z-index. Take note of the negative index applied to .header-bg in the example below:
.header-bg {
width: 100%;
height: 200px;
z-index: -1;
background: lightblue;
position: absolute;
top: 0;
left: 0;
}
.header {
margin-top: 50px;
height: 50px;
background: grey;
z-index
}
.menu {
height: 80px;
}
.site-inner {
height: 400px;
width: 100%;
background: red;
}<div class="header-bg"></div>
<div class="header"></div>
<div class="menu">menu</div>
<div class="site-inner">Site inner</div>
<div class="footer"></div>Utilizing a negative z-index allows elements to be positioned behind others, making the solution relatively straightforward.
<div class="color"></div>
<div class="fixed">
<div class="header">
</div>
<div class="nav">
Text
</div>
<div class="body">
</div>
</div>
html, body
{
height: 100;
margin: 0;
}
div.color
{
position: absolute; /*Remove from normal flow*/
top: 0; /*Position at top left*/
left: 0;
z-index: -1; /*Place below other elements*/
width: 100%; /*Full width*/
height: 300px; /*300px in height*/
background: #c7edfb; /*Specific color*/
}
div.fixed
{
margin: 50px auto 0; /*Push content down by 50px and center it*/
width: 600px; /*Content width is 600px*/
}
div.header
{
height: 150px; /*150px tall gray block on top*/
background: #222; /*Dark gray*/
}
div.nav
{
padding: 25px 0; /*Spacing between blocks*/
}
div.body
{
min-height: 300px; /*Set minimum height*/
background: #777; /*Light gray*/
box-shadow: 0 0 8px black; /*Add drop shadow*/
}
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