How to get background of text boxes on contact form in specific colour? Shella Theme

[Endlessretro]

Evening, 

Please see below a screenshot of my contact form. I would like to change the text box fill background colour to 38C7CA. Please can anyone advise how I do so?

Id like to change all of them - eg where you type your name, email, phone number and your message. Thank you x

[Zworthkey]

Hii, @Endlessretro 
Kindly share your store URL so,
I can solve it perfectly.
Thank You.

[Endlessretro]

@Zworthkey thank you so much. 

Store URL: https://endless-retro-22.myshopify.com/

Many Thanks

[Endlessretro]

@Zworthkey hello, just wondering if you were able to help with this please?

[Endlessretro]

BUMP

[Endlessretro]

Still unanswered if anybody can help please?