How to remove parallax background image on mobile only

I'm trying to remove the background image in one section of my client's website. The problem I'm running into is that this background use the parallax scrolling effect under "image effects" and the code I'm using does not work unless this effect is turned off. 

Here's the code I'm using: 

@media only screen and (max-width: 640px){
section[data-section-id="638f6708f2b3a25317940ad5"]

.section-background img { opacity:0!important }}

I tried adding the code below as well- and it works to remove the background image, however it removes all of the parallax background images and I'm only wanting to target the one section.

@media only screen and (max-width: 640px) {
.section-background-content {
display: none !important;
    }
}

Any insight on this issue is greatly appreciated! 

You can add data-section-id before this code

@media only screen and (max-width: 767px) {
[enter data section id here] .section-background-content {
display: none !important;
    }
}