Sass mixin to create vertical divider. Divider height will be same as previous container that is set position: relative. Working demo can be found from http://jsfiddle.net/ttamminen/dzHDQ/

_vertical-divider.scss

@mixin vertical-divider(
    $primaryColor: #eee, 
    $secondaryColor: #aaa,
    $dividerWidth: 2px) 
{
    width: 1px;
    height: 1px;
    
    &:after {
        content: "";
        position: absolute;
        top: 0;
        bottom: 0;
        width: 2px;
        border-left: $dividerWidth solid $primaryColor;
        background-color: $secondaryColor;
    }
}