inverted commas

I see no one let you know how to make this change. A quick and easy way is to create a new selector in your child theme (assuming you have one) that alters the values. For example, in this image (see link), you can see I changed the font-size to 57px, and the top value to -34 and left value to -19px to pop it up and away a little.

You can also use the customize feature to add a little extra CSS

.testimonial_group .testimonial .rr_review_text .drop_cap {
    font-size: 57px !important;
    top: -34px !important;
    left: -19px !important;
}

Or you can use something like Snippets or WPCodeBox to inject your own CSS where needed.