First things first, log in to your WeWeb account. Head over to the project where you want to sprinkle some custom CSS magic.

Pick the page you want to jazz up with custom CSS. Click on the page name in your project dashboard to open the page editor.

In the page editor, find the 'Style' panel. It's usually hanging out on the right side of the screen. Click it to see more options.

Inside the 'Style' panel, there's an option to add a new class or ID. Click 'Add Class' and give your class a name, like .custom-style.

Now that your class is ready, you can write your custom CSS right in the style editor. Type in your CSS rules, something like this:

.custom-style {
    background-color: #f0f0f0; /* Light gray background */
    color: #333333; /* Dark gray text */
    font-size: 16px; /* Standard font size */
    padding: 10px; /* Padding around the element */
}

Go to the elements on the page where you want to apply your custom CSS. Select the element, and in the 'Element Settings' panel, you'll find an option to add classes. Add the class name you created, like custom-style.

Click on the preview button to see your changes in action. Check out how the custom CSS looks. If it needs tweaking, head back to the style panel and adjust the CSS rules.

Happy with how it looks? Make sure to save your changes. Click on the 'Save' or 'Publish' button, depending on what you need.

Once everything's saved, it's time to make your custom CSS live. Go to the 'Publish' section in your dashboard, choose the right settings, and click 'Publish'.