Get height of element with sass

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I make a website and make the background color of my nav-element to 0.7. I do this because on the background I'll place an image. On this image I've added an example and my code.

Here you could find my code:

HTML

<nav class="navbar">
    <ul class="nav">
        <li><a href="#">Log in</a></li>
        <li><a href="#">Register</a></li>
    </ul>
    <div class="cf"></div>
</nav>
<img src="http://www.siwallpaperhd.com/wp-content/uploads/2016/03/tv_series_viking_background_wallpaper.jpg"/>

CSS

body {
    margin: 0;
}

img {
    width: 100%;
    position: relative;
    top: -25px; // need height of navbar.
    z-index: -1;
}

nav {
    background-color: rgba(150, 0, 0, 0.7);
    margin: 0;
    
    ul {
        margin: 0;
        list-style-type: none;
        
        li {
            float: left;
            margin: 15px;
            
            a {
                color: white;
            }
        }
    }
}

.cf {
    clear: left;
}

Here you have an image.

Here you have a Fiddle[^].

Now my question is: how could I get the hight of my navbar with SaSS?

What I have tried:

Search on the internet but nothing found

Posted 23-Dec-16 7:18am

Hein Pauwelyn

Updated 24-Dec-16 22:17pm

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Kornfeld Eliyahu Peter · Accepted Answer · 2016-12-24T22:17:00

You are asking for the final - computed - height?
You can not... SASS can't do nothing that CSS can't do...
So the only options is specifying the height explicitly and use it as fixed value...

CSS

nav {
    background-color: rgba(150, 0, 0, 0.7);
    margin: 0;
    height: 50px;

    ul {
        margin: 0;
        list-style-type: none;
        
        li {
            float: left;
            margin: 15px;
            
            a {
                color: white;
            }
        }
    }

img {
    width: 100%;
    position: relative;
    top: -50px; // need height of navbar.
    z-index: -1;
}
}