Expand particles.js to background

Question

I bought a template and I'm modifying it to make my website, I'm a designer, and I do not have much idea of code but I want to learn and I decided to venture into making the web like this. I want to put the plugin particles.js as background, I managed to put it in the index but I have been put like this and I have no idea how to do to expand it. As if in photoshop take it from a corner and drag to occupy the whole background.

Here's the problem:

And here's the particle.js div onto index.html:

<div id="particles-js"
     style="background-color: #000; position: absolute; background-size: cover; background-repeat: no-repeat; background-position: 100%;">
     <canvas class="particles-js-canvas-el"
            style="width: 100%; height: 100%;" width="1617" height="708">
     </canvas>
</div>

It's located above scripts and below the footer.

Answer 1

All you need is some CSS to position the <div>. Add this to your <style> tag. A good place to start when you get stuck in the future is the W3 Schools CSS intro. Best of luck!

/* the #id of your div */
#particles-js {
    /* stay in a constant spot on the page, regardless of scroll */
    position: fixed;
    /* fill the entire page */
    width: 100%;
    height: 100%;
    /* remove the space along the edges */ 
    margin: 0;
    padding: 0;
    /* position it to start at the top of the page */
    top: 0;
    /* put it behind other content */
    z-index: -1;
}