How to customize height of HTML

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hello,
i try to customize the height of my menu for html which are equally with the total height of my browser

but i found that when i set the height of my menu as 100%
it was not the height i want
before i set the height i made a title bar
so i found that the height of my html file was equal to my height of title bar + 100% of the height of web browser

when i try to set the height as :

height : 100% - (value for the height of title bar )

the value of my menu return to the normal size

can anyone correct my code?
I will attach my code below

What I have tried:

.titleBar{
height : 45;
}

.navMenu{
height : 100% - 45px;
}

Posted 20-Jan-17 18:36pm

newbie1992

Updated 21-Jan-17 3:02am

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Peter Leow · Answer 1 · 2017-01-21T03:02:00

To set some dimension based on certain percentage of the parent container, you must set the dimension of the parent container first. e.g.

<!DOCTYPE html>
<html>
<head>
<style>
html, body { 
	height: 100%;
	margin:0 }
div {
    height:100%;
    background:green;
}
</style>
</head>
<body>
<div>Menu</div>
</body>
</html>

Or, you can use the unit of

vh

Refer:
1. CSS Units[^]
2. Viewport units: vw, vh, vmin, vmax - Web Design Weekly[^]