Replace Link Icon in Social Links

Site pw: F3rgie2024!

Hello,

I've managed to change the Link Icon to a custom icon (png file uploaded in CSS) using the below:

.icon--fill:nth-of-type(3) {
 color:rgba(0,0,0,0);
    background-image: url(https://static1.squarespace.com/static/65e93cc00c653a11c1976980/t/65fd036d69dcf652f1724074/1711080301766/icon-line.png);
    background-size: 100%;
  background-repeat: no-repeat;
}

It's the third icon on the header menu. However, I cannot mange to change it in the Mobile menu. Can you please help with CSS for this? Thank you in advance!

What is site url?

Sorry, I thought the site was disclosed in one of the ticket's fields.

https://porcupine-toucan-8j23.squarespace.com/

Site pw: F3rgie2024!