Without messing with the line-height:
div{
position: relative;
font-size: 16px;
line-height: 24px;
width: 25px;
padding: 0px 0px 0px 10px;
}
div:before {
position: absolute;
content: '';
top: 6px;
left: 0px;
bottom: 6px;
width: 0px;
border-left: 1px solid black;
}
The values top
and bottom
should equal (line-height - font-size) / 2
but due to different character height will need some manual nudging.