Your plugin can add additional css (and javascript) files into generated pages. Functions wp_register_style() and wp_enqueue_style() with proper parameters should make it work. To not load Bootstrap more than once, use wp_style_is() function. You can find more in documentation.
I know it’s bad practice to use !important frequently but you could use it on any style that’s not showing just to check if your theme is overriding your code.
Check the avada-documentation: https://theme-fusion.com/support/documentation/avada-documentation/ -> Menu -> Extra -> Videos In Lightbox -> How To Set Video Size in Fusion Theme Options How To Set Video Size in Fusion Theme Options Step 1 – Navigate to the Avada > Theme Options tab. Step 2 – Go to the Lightbox tab, and locate the Slideshow Video … Read more
You can use media queries to change the styling per element depending upon specifications. You would have to add these to the bottom of your stylesheet, so that it overwrites your default styles depending upon the screensize This following media-queries template from bootstrap is only based on screen size. You can use more complex media-queries … Read more
The background colour of the header in Twenty Fourteen is defined in /wp-content/themes/twentyfourteen/style.css at line #847: .site-header { background-color: #000; max-width: 1260px; position: relative; width: 100%; z-index: 4; }
Is this theme mobile friendly at all of has some bugs on mobile displays? Go and preview the theme on your mobile device to find out if it’s friendly or not – wordpress.org/themes/twentyeleven. You can also use a service like BrowserStack to test in various browsers and testmysite.thinkwithgoogle.com to get a score for UX. Any … Read more
The best way to do this would be to use CSS3 media quires: @media (max-device-width: 480px) but requires more work. The quick and dirty way to make your WordPress theme app-like would be to add the viewport meta tag to the <head> of your page: <meta name=”viewport” content=”width=device-width, initial-scale=1, maximum-scale=1″> Viewport scales you page to … Read more
Turn off your cache, and the variables should work as expected. Caching saves copies of your output and doesn’t execute the code every time the page loads. As a result, server variables might contain information form a past page load as opposed to a current page load.
This is mostly off-topic, but your assumption that srcset is somehow related to going desktop => mobile is just false. the srcset attribute notifies the browser about alternative images and sizes and it is the browser that selects which image to use based on whatever criteria it wants. Therefor there is most likely nothing wrong … Read more
Nothing appears to happen because the size of the images is smaller than the available width. If I add a bunch of padding to the container in Chrome and then resize the window, the image scales once all horizontal width is consumed.