#external
{
background-color: #585858;
width: 200px;
height: 200px;
}
#internal
{
background-color: #111858;
width: 50px;
height: 100%;
}
<div id="external">
content 1
<div id="internal"></div>
</div>
In this case, how can I set a remnant height of external div to the internal div? The problem is when I set 100% height to internal div, so internal height == external height.