How do I expand a different div when a button is rolled over?

so want is, when button rolled on want expand outer div button sitting in not own div, div on outside of button wich <nav></nav> div.

so structure in html

<nav>

</nav>

i have rules governing img within <a></a> anchors want img rolled on changes height of nav div.

please help?

is nav div same size image?

if so, use :hover effect on div in css.

#nav {

height:100px;

width:100px;

}

#nav:hover {

height:150px;

}

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