html - How do I align the 2 stacked elements using the same background image so it looks like one image? -

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the header of website's homepage consists of following layout:

<header>   <div class="navbar-lock"></div>   <div class="hero"></div> </header>

where div.navbar-lock fixed navigation initial height of 90px, , div.hero contains header text. visually, want give appearance 1 background image (2000px x 481px) spans height , width of both. on scroll, fixed navbar's background top 90px of image; when scroll position @ top of page, header once again appears 1 background image.

what i've tried:

approach a:

header {   background: #f60 url(../images/header_bg.jpg) no-repeat 0 0;   background-size: cover; } div.navbar-lock {   background: #f60 url(../images/header_bg.jpg) no-repeat 0 0;   background-size: cover;   min-height: 90px;   padding-top: 20px;   position: fixed;   top: 0;   z-index: 100;   width: 100%; }

approach b (crop image 2):

div.navbar-lock {   background: #f60 url(../images/header_bg.jpg) no-repeat 0 0;   background-size: cover; } div.hero {   background: #f60 url(../images/header_bg.jpg) no-repeat 0 -90px;   background-size: cover;   position: relative;   top: 90px;   padding: 80px 0 134px; // padding position text }

but in both attempts, unable image(s) line properly. missing here?

i put header , hero div's parent div. , put image onto parent div.


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