Hide checkbox using CSS in Wordpress

I would like to hide the default checkbox from my light/darkmode toggle featured on my Wordpress blog. (Using single.php)

I inspected the code using the console and adjusted the CSS using the code below in the preview which worked. However, when I saved and ran it properly, I didn't get the same outcome.

input[type=checkbox], input[type=radio] {
box-sizing: border-box;
padding: 0;
display: none !important;
}

            <section id="blog-post">
                <div class="container-fluid">
                    <div class="row justify-content-center">
                        <div class="col-10">
                        <div class="checkbox mt-3 text-right">
                            <input type="checkbox" id="darkSwitch">
                            <label for="darkSwitch"><i class="far fa-lightbulb fa-lg"><i>Light switch</i></i></label>
                        </div>   
                            <div class="row my-5 justify-content-center">
                                <div class="col-sm-12 col-md-10 col-lg-8 mt-3">                                    
                                    <h2 class="subheader mt-3">Lorem Ipsum Dolor Amet.</h2>
                                    <div class="dropcap">
                                        <pre></pre>
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