Customize the spinner + fade effect

I think it would be a good feature to be able to upload a custom spinner. The default one is pretty generic. It would be nice to upload a custom one with the brand’s colour.

Also, for the background image, it looks nicer if there is a transparent option. I used the following SCSS for a smooth effect. I feel like something like this should be in the options:

// Lazy Loading
img[data-lazy-type=”image”] {
opacity: 0.3;
transition: opacity 0.3s;

&.lazy-loaded {
opacity: 1;
}
}

.lazy-hidden, .entry img.lazy-hidden, img.thumbnail.lazy-hidden {
background-color: transparent !important;
}