html - Multiple layers of absolute positioning -

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i creating comment stream layout, has bar in background has position:absolute. comment items placed on top of bar. works fine, people able mention other users in comment. dropdown menu open when typing @ placed behind consecutive comment. dropdown menu using position: absolute whereas comment has position:relative. seems these multiple layers don't work together.

<div class="timeline">   <div class="comment">     <input placeholder="mention @username">     <div class="mention-dropdown">       <div class="mention">username</div>       <div class="mention">username</div>       <div class="mention">username</div>       <div class="mention">username</div>       <div class="mention">username</div>     </div>   </div>   <div class="comment">     comment text   </div>   <div class="comment">     comment text   </div>   <div class="comment">     comment text   </div>   <div class="comment">     comment text   </div>   <div class="comment">     comment text   </div>   <div class="comment">     comment text   </div>   <div class="background">     <div class="bar"></div>   </div>   <div class="start">     start   </div> </div>

my css looks this:

.timeline {   .comment {     input {       width: 100%;     }     z-index: 10;     width: 300px;     border: 1px solid gray;     border-radius: 5px;     background-color: rgb(102, 255, 255);     padding: 10px;     margin: auto;     margin-bottom: 15px;     position: relative;     .mention-dropdown {       width: 100%;       position: absolute;       background-color: gray;       left: 0;       z-index: 20;     }   }   .background {     height: 100%;     width: 100%;     position: absolute;     height: 100%;     width: 100%;     top: 0;     .bar {       top: 0;       width: 0px;       height: 100%;       border: blue solid 2px;       position: absolute;       left: calc(50% - 3px);     }   }   .start {     left: calc(50% - 3px);     position: absolute;     bottom: 0;     background-color: white;   } }

i recreated problem in code pen: https://codepen.io/timolemow/pen/eekvln

any appreciated! thank you.

you have remove position relative on div.comment , add on first.

.timeline .comment-wrapper {   position:relative;  }

https://codepen.io/anon/pen/rzkvpq





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