php - CSS - website overlay when page is loaded -


im setting website different navigation structure compared whats traditional, , want add overlay on top of site loaded when user enters site first time.

the overlay should fullscreen, black "opacity=50", , im going add simple text how use website. should go away when klicking

im web designer, , have limited knowledge in coding. (some css/html/php)

is there simple way add class this?

thanks feedback

simple enough html

<div id='overlay'>   <div id='contents'>... </div>

the css:

#overlay {   background-image : url('images/overlay.png');   width:100%;   height:100%;   position: fixed;   top: 0;   left: 0; }  #contents {   width: 300px;   height: 300px;   margin: auto; }

i use image overlay because opacity setting carried through contents area , no javascript required or ever needs used type of content.


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