html - Mask effect below pop-up box using pure CSS -


i convert div on webpages pop-up box adding class, turnintooverlay , div. (see jsfiddle)

.turnintooverlay {     position: fixed;     background-color: white;     top: 60px;     max-width: 680px;     z-index: 80;     border: 6px solid #bbb;     box-shadow: 0 1px 10px rgba(0, 0, 0, 0.5);     max-height: 800px;     overflow: auto;     padding:10px; }

now when pop displayed want create mask puts faded layer(or mask) rest other page elements appear below popup box. create mask, resorted pure css approach using psuedo selectors, mask shown/hidden when popup box( turnintooverlay element) visible. added following css:

.turnintooverlay:after {     content: "";     background-color: whitesmoke;     position: fixed;     width: 100%;     height: 100%;     z-index: -1;     opacity: 0.5;     top: 0;     left: 0; }

everything works fine except mask appears on pop when keep z-index lower of popup. surprise, works when z-index=-1. can please suggest how rectify ?

see jsfiddle here

my solution use both :before , :after solve problem:

.turnintooverlay {     position: fixed;     background-color: white;     top: 60px;     max-width: 680px;     border: 6px solid #bbb;     box-shadow: 0 1px 10px rgba(0, 0, 0, 0.5);     max-height: 800px;     overflow: auto;     padding:10px;     z-index: 80; }  .turnintooverlay:before {     content: "";     background-color: skyblue;     position: fixed;     width: 100%;     height: 100%;     z-index: -1;     opacity: 0.4;     top: 0;     left: 0; }  .turnintooverlay:after{     position: absolute;      width: 100%;     height: 100%;     top: 0;      left: 0;     background-color: white;     z-index: -1;     content: ""; }

jsfiddle


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