Help us understand the problem. What is going on with this article?

押すと色が変わるボタンの作り方を教えてください

初めましてプログラミング初心者です

個人アプリ作成しています

ボタンが押されたときにボタンの色が変わるように実装しています

教えていただける方いましたらお願いします

haml
%input{type: "button", value: "12", class: "btn"}

js
$(function(){
$('.btn').on('click', function(event){
event.preventDefault();
$(this).toggleClass('active');
});
});

scss
input{
width: calc(100% / 5);
height: 40px;
color:whitesmoke;
margin-left: 8px;
.btn.active{
color: red;
background-color: red;
}

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