Change Background Color of one Page in Avenue

Site URL: https://undro.net/

I know this has been answered so many times but none of the answers are working for me. 
I am trying to change the color of one layout page in Avenue template.

This one to be specific: https://undro.net/#/elnatt/ 

I have tried custom css

.collection-type-index #elnaat
background color: #F8F5EC !important;

and page header injection

<style> .Main { background-color: #F8F5EC !important; } </style>

and different versions of these that don't seem to work. 

I have also seen this in places but it updates the whole website:

body#collection-56ccfe89c2ea5165a6f983a1 {
    background: white;
}
body#collection-56ccfe89c2ea5165a6f983a1 #canvas {
    background-color: white !important;
}

On 4/14/2022 at 2:46 AM, AndrewSe7s said:

Site URL: https://undro.net/

I know this has been answered so many times but none of the answers are working for me. 
I am trying to change the color of one layout page in Avenue template.

This one to be specific: https://undro.net/#/elnatt/ 

 

I have tried custom css

.collection-type-index #elnaat
background color: #F8F5EC !important;

and page header injection

<style> .Main { background-color: #F8F5EC !important; } </style>

and different versions of these that don't seem to work. 

I have also seen this in places but it updates the whole website:

body#collection-56ccfe89c2ea5165a6f983a1 {
    background: white;
}
body#collection-56ccfe89c2ea5165a6f983a1 #canvas {
    background-color: white !important;
}

which page you want to apply the background?

let me know section and page pls.