Vertical Line

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Hello! Trying to find a solution for creating a vertical line. Thing is, line does not go up the whole height of the container (or images to left or right of line). Anything I am missing, or an easy fix?

Thank you!

CSS:

div.vertical-line{
width: 1px;
background-color: black;
height: 100%;
float: left;
}

HTML
<div class="vertical-line" />

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