infocities/caculate_navbar_height.md

## caculate_navbar_height.md

      
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              caculate_navbar_height.md
            
          
add this javascript

document.documentElement.style.setProperty('--nav-height', document.getElementById("navbar").offsetHeight);

use property iny css

:root {
    --nav-height: 70px; /*You HAVE To Give A Default Fallback Value*/
}

.container-fs{
    width: 100vw;
    height: calc(100vh - var(--nav-height));
}