Hi,
id like to change this message to full screen after submission and have the background white with black font.
https://lux360.net/pages/marketplaces?contact_posted=true#contact-us-page
Hi @Luxurymrkt
You can do that by adding this code to Custom CSS in Online Store > Themes > Customize > Theme settings
#contact-us-page .form-success {
color: #000;
background-color: #fff;
margin-left: -16px;
margin-right: -16px;
}
You can add the following css code to do full screen.
.form-success{
color: #000;
background-color: #FFF;
border-color: #000;
padding: 10px;
margin-bottom: 20px;
height: 100%;
position: absolute;
z-index: 1;
width: 100%;
}
Hi @Luxurymrkt
This is Amelia from PageFly - Landing Page Builder App
You can try this code by following these steps:
Step 1: Go to Online Store->Theme->Edit code.
Step 2: Search file theme.css
Step 3: Paste the below code at bottom of the file → Save
p.note.form-success {
color: black;
background: white;
}
Hope that my solution works for you.
Best regards,
Amelia | PageFly
Step 1: Go to Shopify Admin → Online Store ->Theme → Edit code
Step 2: Search file theme.liquid
Step 3: Insert this code above
Result:
If it helps you, please like and mark it as the solution.
Best Regards 
Hello @Luxurymrkt
Go to online store ----> themes ----> actions ----> edit code ---->theme.css
add this code at the end of the file and save.
.note.form-success {
color: #000 !important;
background: #fff !important;
}
result
If this was helpful, hit the like button and accept the solution.
Thanks