CSS variables.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Variable</title>
    <style>

        :root{
            --color: rgb(61, 61, 207); 
            --seccolor: rgb(174, 174, 222);
            --defpad:23px;
            --defop:0.4;
        }

        *{
            margin: 0;
            padding: 0;
        }
        .nav{
            background-color: var(--color);
        }

        ul{
            display: flex;
        }

        ul li{
            opacity: var(--defop);
            list-style: none;
            padding: var(--defpad);
            border: 2px solid var(--seccolor);
        }

        ul li:first-child{
            /* --color: rgb(207, 105, 61); */
            background-color: var(--color, blue);
        }
        .container{
            background-color: var(--seccolor);
        }
    </style>
</head>
<body>
    <div class="nav">
        <ul>
            <li>home</li>
            <li>About</li>
            <li>contact</li>
        </ul>
        
        
    </div>

    <div class="container">
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Beatae assumenda suscipit exercitationem quam repellendus, aspernatur quisquam veritatis laudantium blanditiis laboriosam magni iusto ipsa.


    </div>
    
</body>
</html>