html - How do I add a parameter (class) to an URL -

this assignment i've got school:

create new class selector in css-file named 'current' element in nav. background color should #db2b2b , text color must white.

next add parameter class="current" correct link in index.html.

this code of both css-file , html-file:

css

.current {         background-color: #db2b2b;         color: white;         }

html

<nav>         <a href="index.html">home</a> </nav>

the problem i'm dealing don't know add parameter , how. might have noticed, goal show on tab giving different color , text.

you can replace code bellow

<nav>     <a class="current" href="index.html" >home</a> </nav>

and css below

a.current {     background-color: #db2b2b;     color: white;     }

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