Adapting CSS according to input selection

Forgive me for asking what may seem like a simple question. I am currently using the CSS code below to modify the background color of a label when its associated checkbox is checked:

#project input[id="button1"]:checked + label {background-color:red;}

Is it also possible to change the background color of the entire page when id="button1" is checked? I attempted to add to the existing line and tried a new one, but with no success:

input[id="button1"]:checked {background-color:blue;}

Shouldn't that impact the background outside of the DIV? I am unable to find a solution. The final result should reflect both the label's background color and the page's background color based on the checkbox state.

css

Answer №1

input[id="button1"]:checked {background-color:blue;}

"Will the background color change affect anything outside of this specific element?" - No, it will only impact that particular input field.

Typically, achieving this effect solely through CSS is not possible without a hypothetical :contains selector:

body:contains(input[id="button1"]:checked) {background-color:blue;}

Unfortunately, implementing the :contains selector in CSS comes with significant computational complexities.

Answer №2

Using pure CSS events allows you to modify the styles of elements that are directly nested within the element triggering the event. Since your body is not a direct child of the checkbox input (unless you're in an altered state), the only solution is to utilize JavaScript or jQuery.

Check out this basic example

var button = document.getElementById('button1');

button.addEventListener('click', function() {
    document.querySelector('body').classList.toggle('blue');
});

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