After a lot of searching, I finally found this piece of code, that almost fully does the trick:

.avia_mobile .av-parallax {
height: 100% !important;
}

Now on the iPhone portrait position, the text within the color section is appearing very low down, how can I position it higher?

Screenshot: https://www.dropbox.com/s/om92pkyfv3rf83h/IMG_2167.PNG?dl=0