Adjust Position of Custom Liquid Image for MobileView only

[JoyboyNika]

Hello Friends i really need help please

I added an Image with custom liquid on my product page below the add to shoppingcart button.

On desktop view it is perfect but...

on mobile View its not centered below the button. How can i center it seperatly for mobile??

The code for custom liquid i used: 

<div style="width: 70%;
display: flex; justify-content: center;">
<div>
<img src="{{ 'imagefinal.png' | file_img_url:'500x200'}}">
</div>

thanks in advance!

[Columbus_Themes]

Add a link to your store.