JSFiddle - React, Tailwind, and code Playground

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">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>

<body>
    <div class="navigation">
        <ul>
            <li class="list active">
                <b></b>
                <b></b>
                <a href="#">
                    <span class="icon">
                        <ion-icon name="home-outline"></ion-icon>
                    </span>
                    <span class="title">Home</span>
                </a>
            </li>
            <li class="list">
                <b></b>
                <b></b>
                <a href="#">
                    <span class="icon">
                        <ion-icon name="people-outline"></ion-icon>
                    </span>
                    <span class="title">Profile</span>
                </a>
            </li>
            <li class="list">
                <b></b>
                <b></b>
                <a href="#">
                    <span class="icon">
                        <ion-icon name="settings-outline"></ion-icon>
                    </span>
                    <span class="title">Setting</span>
                </a>
            </li>
            <li class="list">
                <b></b>
                <b></b>
                <a href="#">
                    <span class="icon">
                        <ion-icon name="settings-outline"></ion-icon>
                    </span>
                    <span class="title">Help</span>
                </a>
            </li>
            <li class="list">
                <b></b>
                <b></b>
                <a href="#">
                    <span class="icon">
                        <ion-icon name="document-text-outline"></ion-icon>
                    </span>
                    <span class="title">Message</span>
         ...

CSS

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@100&display=swap');

* {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    background-color: #fff;
}

.navigation {
    position: fixed;
    top: 20px;
    left: 20px;
    bottom: 20px;
    width: 70px;
    border-radius: 10px;
    box-sizing: initial;
    border-left: 5px solid #4d5bf9;
    background: #4d5bf9;
    transition: width 0.5s;
    overflow-x: hidden;
}

.navigation.active {
    width: 300px;
}

.navigation ul {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding-left: 5px;
    padding-top: 40px;
}

.navigation ul li {
    position: relative;
    list-style: none;
    width: 100%;
    border-top-left-radius: 20px;
    border-bottom-left-radius: 20px;
}

.navigation ul li.active {
    background-color: #fff;
}

.navigation ul li.active a {
    color: #333;
}

.navigation ul li a {
    position: relative;
    display: flex;
    width: 100%;
    text-decoration: none;
    color: #fff;
}

.navigation ul li.active a .title {
    color: #000;
    font-weight: bold;
}

.navigation ul li a .icon {
    position: relative;
    display: block;
    min-width: 60px;
    height: 60px;
    line-height: 70px;
    text-align: center;
}

.navigation ul li a .icon ion-icon {
    font-size: 1.5em;
}

.navigation ul li a .title {
    position: relative;
    display: block;
    padding-left: 10px;
    height: 60px;
    line-height: 60px;
    white-space: nowrap;
}

.navigation ul li b:nth-child(1) {
    position: absolute;
    top: -20px;
    height: 20px;
    width: 100%;
    background-color: #fff;
    display: none;
}

.navigation ul li b:nth-child(1):before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #4d5bf9;
    border-bottom-right-radius: 20px;
}

.navigation ul li b:nth-child(2) {
    position: absolute;
   ...