you could draw it from a pseudo element set in absolute positionning.
div.wrapper {
position:relative
}
/* ! remove sidebar-divider border */
div.wrapper:before {
content:'';
border-left: 1px solid #ccc;
position:absolute!important;
top:0;
bottom:0;
right:24.25%;
}
it could be drawn from .sidebar-divider too with a bit more CSS
div.wrapper {
position:relative
}
div.wrapper * {
position:static;
border:none;
}
/* ! remove sidebar-divider border */
div.sidebar-divider:before {
content:'';
border-left: 1px solid #ccc;
position:absolute!important;
top:0;
bottom:0;
right:24.25%;
}