html - How to set a shadow on a two panels page, regardless of its height? -

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i have found answer, not sure best approach problem. page has 2 panels: 1 sidebar , 1 content view. want have shadow on sidebar if content view producing it:

sidebar , content view

the problem sidebar menu buttons, icons, etc. if try set (inset) shadow there:

.sidebar {     box-shadow: inset -7px 0 9px -7px rgba(0,0,0,0.7); }

i get:

enter image description here

so, have buttons, hide shadow. if other way content view produces it:

.content {     box-shadow: -7px 0 9px -7px rgba(0,0,0,0.7); }

i shadow along content, if content "shorter" total height of screen, shadow disappears. similar previous case.

my final approach set manual height content view or javascript, adapt viewport height. not sure best way it. know if there more css way it, without having set things manually or getting shadows cut.

edit

while creating fiddle better understanding problem realized had background-color on buttons. since have hover , transition on button, still hides shadow. check out: http://jsfiddle.net/h3cp59qd/

check out: http://jsfiddle.net/h3cp59qd/3/

use position:absolute both sidebar , content:

body, html {     background: #d8d8d8;     height: 100%;     margin: 0;     padding: 0; }  #app {     width: 100%;     height: 100%;     position: relative; }  #sidebar {     width: 20%;     z-index: 1;     position: absolute;     top: 0;     bottom: 0;     background: #c8c8c8; }  #sidebar ul {     list-style-type: none;     margin: 0;     padding: 0; }  #sidebar ul li {     padding-left: 20px;     height: 60px;     text-transform: uppercase;     color: white;     font-weight: 900;     font-size: 12pt;     line-height: 60px;     vertical-align: middle; }  #sidebar ul li:hover {     background: #c0c0c0;      color: #eee; }  #content {     width: 80%;     position: absolute;     z-index: 100;     left: 20%;     top: 0;     bottom: 0;     padding: 0 50px;     box-shadow: -7px 0 9px -7px rgba(0,0,0,0.7); }

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