Motivations

for (int i = 5; i < 10 ; i++) {
    Console.WriteLine("Hello Moto?");
}

If you are using Vantage for your WordPress site, and you want to make your code block looks fancy, follow the instructions:

Instructions

1. Make sure you have created a child theme based on Vantage, and it's activated.

2. Reset styles applied to code block.

I highly recommend to work with WP-SCSS plugin when writing CSS/SCSS, so you can have stylesheets organized without the costs of performance by using @import.

/* Reset the style set by Vantage (the parent theme) */
.entry-content pre, .entry-content code {
    background: unset;
    font-family: unset;
    border: unset;
    box-shadow: unset;
    overflow-x: unset;
}

Later we will apply prism.js and its stylesheet.

3. Insert code snippits to your child theme's "functions.php"

function code_pre_theme(){
    // To check if currently viewing page is a "post"
    if (is_singular('post')) {
        wp_enqueue_script('prism-js', 'https://cdn.jsdelivr.net/npm/[email protected]/prism.min.js');
        wp_enqueue_script('prism-core-js', 'https://cdn.jsdelivr.net/npm/[email protected]/components/prism-core.min.js');
        wp_enqueue_style('prism-css', 'https://cdn.jsdelivr.net/npm/[email protected]/themes/prism.min.css');
        wp_enqueue_script('prism-autoloader-js', 'https://cdn.jsdelivr.net/npm/[email protected]/plugins/autoloader/prism-autoloader.min.js');
    }
}
add_action('wp_enqueue_scripts', 'code_pre_theme', 10); //Number 10 heres depend on site. The princlple is to set a number larger than the essential scripts and styles belong to your parent theme, which is vantage in this case.

By enqueuing prism-core.min.js and prism-autoloader.min.js, it will utomatically loads languages's style when necessary.
You may opt-in languages based on your needs. For example, to load certain style based on has_tag('php'), has_tag('csharp') result.
Visit prism.js at cdnjs.com for more programming language supports.

Conlusion

You don't have to follow every steps as I did, as you may come up with a better solution for your own site.

At the time I wrote this article, I absolutely have zero knowledge in PHP, only knowing C#, Javascript, Java, SCSS; writing and modifying some php script isn't complicated, so go ahead and try all the possibilities.