Hey, developer today is Day 64 of our 90Projects in 90Days. So on Day-64, we are going to Create a Responsive Mobile Navigation using HTML CSS.
To run the given code firstly you have to copy the HTML code and run it into your code editor and then create a CSS file and paste the given CSS code in your code's CSS file.
Preview

HTML Code
index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.3.0/css/all.min.css"
        integrity="sha512-SzlrxWUlpfuzQ+pcUCosxcglQRNAq/DZjVsC0lE40xsADsfeQoEypE+enwcOiGjk/bSuGGKHEyjSoQ1zVisanQ=="
        crossorigin="anonymous" referrerpolicy="no-referrer" />
    <link rel="stylesheet" href="style.css" />
    <title> Mobile Tab Navigation </title>
</head>
<body>
    <nav class="navigation">
        <div class="desktop">
            <h2> Geeks Help </h2>
            <ul>
                <li class="active"><a href="#"> Home </a></li>
                <li><a href="#"> Services </a></li>
                <li><a href="#"> Bookmarks </a></li>
                <li><a href="#"> Account </a></li>
            </ul>
        </div>
        <hr>
        <div class="phone">
            <ul>
                <li class="active">
                    <i class="fa-solid fa-house"></i>
                    <a href="#">Home</a>
                </li>
                <li>
                    <i class="fa-solid fa-rocket"></i>
                    <a href="#"> Services </a>
                </li>
                <li>
                    <i class="fa-solid fa-book-bookmark"></i>
                    <a href="#"> Bookmarks </a>
                </li>
                <li>
                    <i class="fa-solid fa-user"></i>
                    <a href="#"> Account </a>
                </li>
            </ul>
        </div>
    </nav>
</body>
</html>
CSS Code
style.css
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}
body {
    background-color: #2e2333;
}
.navigation {
    display: flex;
    color: #fff;
    align-items: center;
    flex-direction: column;
    justify-content: space-around;
}
.desktop {
    width: 100%;
    display: flex;
    align-items: center;
    padding: 1.2rem 5rem;
    justify-content: space-between;
}
.desktop h2 {
    font-size: 27px;
}
.desktop ul {
    display: flex;
    list-style: none;
}
.desktop ul li {
    opacity: 0.6;
}
.desktop ul li:hover {
    opacity: 1;
}
.desktop ul li a {
    color: #fff;
    padding: 7px 10px;
    text-decoration: none;
}
hr {
    width: 100%;
    opacity: 0.2;
}
.phone {
    display: none;
}
@media screen and (max-width: 640px) {
    .desktop {
        display: none;
    }
    .phone {
        display: flex;
        position: absolute;
        bottom: 10px;
    }
    .phone ul {
        display: flex;
        list-style: none;
        justify-content: space-around;
        width: 100%;
    }
    .phone ul li {
        cursor: pointer;
        margin: 5px 10px;
        opacity: 0.2;
    }
    .phone ul li:hover {
        opacity: 1;
    }
    .phone ul li a {
        text-decoration: none;
        color: #fff;
        margin-left: 10px;
    }
    hr {
        position: absolute;
        bottom: 50px;
        width: 100%;
        color: #fff;
    }
}
@media screen and (max-width: 445px) {
    .phone ul li {
        display: flex;
        margin: 5px 10px;
        flex-direction: column;
        align-items: center;
        row-gap: 10px;
    }
    .phone ul li a {
        margin-left: 0px;
    }
    .phone ul li a,
    .phone ul li i {
        font-size: 13px;
    }
    hr {
        position: absolute;
        bottom: 65px;
        width: 100%;
        color: #fff;
    }
}

