html - How to make header like that in css? -


my site code usual

<div class="header"></div> <div class="site-inner"></div> <div class="footer"></div>

how can make header background on image? whole site content have position absolute , margin-top:-500px ?

is case it?

header

i assume mean overlap.

negative margin 1 way.

.header {    height: 50px;    background: lightblue;  }  .site-inner {    width: 80%;    margin: auto;    height: 50px;    background: lightgrey;    margin-top: -30px;    box-shadow: 0 -2px 2px black;  }
<div class="header"></div>  <div class="site-inner"></div>


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