This line is missing a close parenthesis ) which is affecting your markup:

background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0.02,   rgb(75,135,163)), color-stop(0.54, rgb(127,219,219))

Change it to this:

background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0.02,   rgb(75,135,163)), color-stop(0.54, rgb(127,219,219)));

You should look into using W3C's HTML and CSS validation tools to catch problems like these. The HTML validator isn't great about catching bad CSS, so you can copy-paste your embedded CSS into the CSS validator.

Oh and might as well put a semi-colon at the end of that last background-image statement (I did it for you), since it'll save you grief if you add more lines in the future but forget to add the semi-colon to the previous line.

Answer from Anson on Stack Overflow
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freeCodeCamp
forum.freecodecamp.org › html-css
My CSS isn't working - HTML-CSS - The freeCodeCamp Forum
June 5, 2022 - Tell us what’s happening: t The effects of my CSS isn’t showing even though i’ve linked my CSS to HTML. This also happened on the previous project where i had completed my HTML codes, who knows what’s wrong? Describe your issue in detail here. **Your code so far** /* file: index.html ...
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SitePoint
sitepoint.com › html & css
CSS not loading - HTML & CSS - SitePoint Forums | Web Development & Design Community
It sounds to me like you are loading other HTML and CSS instead of just copying the above “working page” to a new file with an HTML suffix and double-clicking the new file to open it in your browser. For your first test run on the code that I posted, copy and paste the “working page” to a new file on your computer. Give that file a .htm or .html suffix and double-click it to open it in your browser. It should open instantly. Make a screen shot if it does not resemble my screen shot.
Published   May 19, 2018
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meyerweb
meyerweb.com › eric › articles › webrev › 199904.html
Help! My CSS Isn't Working!
In this column, we'll explore a few of them, including the dreaded "disappearing styles" bug in Netscape and an easy way to keep your length values from working. Upon encountering a problem, the first impulse is often to wonder if the styles are correctly written. Fortunately, there are a number of resources to help you figure that part out. There are the articles here at Web Review, of course, but they may not cover your particular situation. You need to make sure that there aren't any errors in either your HTML or your CSS, since mistakes in either place can result in botched document appearance.
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Reddit
reddit.com › r/css › css is not working in vs code- help ( i am linking it correctly)
r/css on Reddit: CSS is not working in Vs code- HELP ( I am Linking it correctly)
October 26, 2020 -

I tried using bootstrap in my code for the first time and then after that my previous css work would not display. Now even though I’ve cut out the bootstrap and even tried making another simple bellow world page just to check , simple css like color won’t work. I’ve tried internal and inline Internal seems to be working for a complicated homepage but doesn’t for a simple hello world

EDIT- here’s my code And
This is it without bootstrap

Find elsewhere
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WordPress.com
wordpress.com › forums › topic › internal-css-not-working
internal css not working | WordPress.com Forums
May 19, 2020 - Hi, if you’re trying to add <style> tags to a page or post here, that won’t work: you’ll need the Premium plan, then you can store the additional CSS separately from your content. https://wordpress.com/premium · Otherwise, you can do inline CSS as needed. The topic ‘internal css not working’ is closed to new replies.
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WPForms
wpforms.com › docs › styling › troubleshooting css
Troubleshooting CSS - WPForms
May 21, 2024 - If you’re not sure, you may want to contact your host to ask if they are caching your site and, if they are, ask them to clear that cache for you. Occasionally, just loading your site over a different internet source can help to bypass an existing cache. If you have a mobile device with available data, the simplest way to do this is to temporarily turn off WiFi on your device and reload the page. CSS must be written in a specific format in order for a browser to understand it.
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freeCodeCamp
forum.freecodecamp.org › html-css
CSS styling not working - HTML-CSS - The freeCodeCamp Forum
December 17, 2021 - Hello, I’m working on the personal portfolio project and I’m running into an issue in the “contact section” of my page. I am trying to style this section but none of the css selectors are having any effect on the html I’ve written. I’ve passed all the tests but I am just unable ...
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Quora
quora.com › Why-is-the-CSS-style-not-applied-HTML-CSS-web-and-development
Why is the CSS style not applied (HTML, CSS, web, and development)? - Quora
Answer: * Perhaps you have a typo or your CSS include statement is not in your path. Please check your header CSS file reference and your CSS location. * Perhaps you have Cloudflare and it so it takes time for a CSS change to update.
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freeCodeCamp
forum.freecodecamp.org › t › external-css-is-not-working-please-help › 358531
External css is not working, please help? - The freeCodeCamp Forum
December 22, 2019 - I have two files, both in the same folder. home.html - linkforthesame styles.css - linkforthesame The external css is not working, please help.
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Reddit
reddit.com › r/css › why is it when i use this css code in my external css file it does not work at all, however if i use it as an internal edit, it works just fine.
r/css on Reddit: Why is it when I use this CSS code in my external CSS file it does not work at all, however if I use it as an internal <style> edit, it works just fine.
January 11, 2019 -
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Practice Site</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="style.css">
        <link rel="stylesheet" href="reset.css">
        <link rel="stylesheet" href="debug.css">
        <link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet"> 
    </head>
    <body>
        <article>
            <p class="debug-centre">ARTICLE</p>
        </article>
        <article>
            <p class="debug-centre">ARTICLE</p>
        </article>
        <article>
            <p class="debug-centre">ARTICLE</p>
        </article>
    </body>
</html>

This is the HTML to my website titled index.html

article {
    display: grid;
    grid-template-columns: 1fr minmax(0, 8.5in) 1fr;
    height: 100vh; /* temp fix */
    padding: 0.5in 0;
    }

article * {
    grid-column: 2/3;
}

And this is my external stylesheet style.css

Now, when I try to add padding to the <article> via my external CSS it does not work, even with the identical code. It only works if I copy paste it into the HTML file using <script>.

How can I fix this, and why does this happen?

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freeCodeCamp
forum.freecodecamp.org › html-css
CSS not working in HTML, help please - HTML-CSS - The freeCodeCamp Forum
March 31, 2018 - This is my first attempt at coding and I do not understand why the CSS is not working. As you can see, I used CSS selector to style an element and as well as classes. However, when I load the .html, classes do not wor…