// Toggle Button to switch light theme to dark..
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Toggle Button</title>
<style>
.dark{
background-color: black;
color: white;
}
.light{
background-color: white;
color: black;
}
</style>
</head>
<body>
<button id="mode">Change Mode</button>
<p>Hi javascript...</p>
<script>
let btnmode=document.querySelector("#mode");
let body=document.querySelector("body");
let currmode = "light";
btnmode.addEventListener("click", () =>{
if(currmode==="light"){
currmode="dark";
body.classList.add("dark");
body.classList.remove("light");
}
else{
currmode="light";
body.classList.add("light");
body.classList.remove("dark");
}
});
</script>
</body>
</html>