html - fixed position div below relative position -

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there many questions on stackoverflow, of ones checked asked exact opposite of question.
have fixed position div , relatively positioned span:

<div class="head-wrap"> ... </div> .... <span class="img-desc" id="main">html lesson - part 1</span>

css:

.img-desc {     position:relative;     background:rgba(5,1,20,.8);     color:yellow;     padding:15px; } #main {     top:-150px;     left:8px;     font-size:2.4em;     z-index:2 !important; } .head-wrap {     z-index:50; }

from have read, fixed-position div supposed pass on relative-positioned span. doesn't! how can make div pass on span, instead of other way around. fiddle.


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