<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css"
        integrity="sha512-1PKOgIY59xJ8Co8+NE6FZ+LOAZKjy+KY8iq0G4B3CyeY6wYHN3yt9PW0XpSriVlkMXe40PTKnXrLnZ9+fkDaog=="
        crossorigin="anonymous" />


<body>
    <div class="center">
        <div class="menu">
            <li class="item" id="profile">
                <a href="#profile" class="btn"><i class="far fa-user" aria-hidden="true"></i> Profile</a>
                <div class="smenu">
                    <a href="">Posts</a>
                    <a href="">Picture</a>
                </div>
            </li>
            <li class="item" id="message">
                <a href="#message" class="btn"> <i class="far fa-envelope" aria-hidden="true"></i> Messages</a>
                <div class="smenu">
                    <a href="">new</a>
                    <a href="">sent</a>
                    <a href="">spam</a>
                </div>
            </li>
            <li class="item" id="Settings">
                <a href="#Settings" class="btn"><i class="fas fa-cog" aria-hidden="true"></i> Settings</a>
                <div class="smenu">
                    <a href="">Password</a>
                    <a href="">Language</a>
                </div>
            </li>
            <li class="item" id="logout">
                <a href="#" class="btn"><i class="fas fa-sign-out-alt"></i> Logout</a>

            </li>
        </div>
    </div>

</body>
* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    list-style: none;
    text-decoration: none;
}

body {
    background: rgb(55, 41, 16);
    background: radial-gradient(circle, rgba(55, 41, 16, 1) 0%, rgba(0, 0, 0, 1) 100%);
    width: 100vw;
    height: 100vh;
}

.center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.menu {
    width: 300px;
    border-radius: 8px;
    overflow: hidden;
}

.item {
    border-top: 1px solid #000;
    overflow: hidden;
    background: #C28C2E;
    color: #222220;
}

.btn {
    display: block;
    padding: 16px 20px;
    background: #C28C2E;
    color: #222220;
    position: relative;
    font-weight: bold;
}

.btn:before {
    content: "";
    position: absolute;
    width: 14px;
    height: 14px;
    background: #C28C2E;
    left: 20px;
    bottom: -7px;
    transform: rotate(45deg);
}

.btn i {
    margin-right: 10px;
}

.smenu {
    background: #222220;
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease;
}

.smenu a {
    color: #C28C2E;
    display: block;
    padding: 16px 26px;
    font-size: 14px;
    margin: 4px 0;
    position: relative;
}

.smenu a:before {
    content: "";
    width: 5px;
    height: 100%;
    position: absolute;
    background: #C28C2E;
    left: 0;
    top: 0;
    transition: 0.3s;
    opacity: 0;
}

.smenu a:hover::before {
    opacity: 1;
}

/*#profile:hover .smenu {
    max-height: 100%;
}*/

.item:target .smenu {
    max-height: 10em;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

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