JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css">
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.min.js"></script>
<body>
    <div class="container-fluid h-100">
        <ul id="messages"></ul>
        <form id="form" action="" class="position-fixed bottom-0 start-50 translate-middle-x w-100">
            <input id="input" autocomplete="off" class="form-control" />
            <button class="btn btn-primary">Send</button>
        </form>
    </div>
</body>

CSS

* {
    border: 1px black solid;
}

html {
    height: 100%;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    height: 100%;
}

#form {
    display: inline-flex;
    backdrop-filter: blur(10px);
}

#input {
    border-radius: 0;
}

#input:focus {
    outline: none;
}

#form>button {
    background: #333;
    border: none;
    outline: none;
    color: #fff;
    border-radius: 0;
}