JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text"  name="Msg" id="Msg" value="Bien inséré !" />

CSS

#Msg[value='Bien inséré !']{
    border: 2px solid red;
    background-color: lime;
}

JavaScript

document.getElementById("Msg").addEventListener("change", function(){ this.setAttribute("value", this.value)                                                                                                                        });