CodePen Embed - PbXNNP

<button onclick="change()">click!</button>
<input type="button" value="remove" onclick="remove()"/>

.orange{
  background-color: orange;
}
.border{
  border: solid red;
}

var obj = document.querySelector("button"); // cible la balise a
obj.className = "orange"; // rajoute la classe orange au paragraphe
obj.classList.add("border"); // ajoute une autre valeur de classe sans supprimer 'orange'
function change(){
  obj.classList.toggle("border");
}
function remove(){
  obj.classList.remove("border");
}

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