If you want to change the colors of the Direct Posts-button, you need to add the CSS code snippets below to your custom CSS box under Settings > Design 👇
Changing the background color:
This snippet changes the background color to orange:
#createPostButton {
background-color: #fbbc56;
}
#createPostButton:hover {
background-color: #fbbc56;
box-shadow: 0 0 0 2px orange;
}
Changing the text color:
This snippet changes the text color to black:
#createPostButton {
color: #000000;
} 
Changing the QR code color:
This snippet changes the QR code color to black:
#createPostButton svg path:nth-of-type(2) {
fill: #000000 !important;
}
In case you have further questions, don't hesitate to contact the support team via chat or support@walls.io!