I am adding css and javascript for some colour changes

[im-kamil]

// css
body {
padding: 25px;
background-color: white;
color: black;
font-size: 25px;
}

.dark-mode {
background-color: black;
color: white;
}

// javascript
function myFunction() {
var element = document.body;
element.classList.toggle("dark-mode");
}