Hi there,

this is the original code for the background overlay:

.eltd-blog-holder article.format-quote .eltd-post-text {
    background-color: rgba(88,188,179,.9);
}

You could do this:

.eltd-blog-holder article.format-quote .eltd-post-text {
    background-color: transparent !important;
}

Or you could just edit the alpha number ".9" to something else like ".5" to get 50% transparency.

Let me know if there is anything else I can help you with.