I have a problem with firebase Realtime database using html/js. I'm trying to add a data like a colours of pattern but every time it overwrites the same node for example.

Patterns
     Monopattern
        colour: white

when I try to add colour black it overwrite the white to black I'm searching for a way to set a specific name to name "colour" to add it as a child of the Monopattern.

function add_colours(){
            set(ref(db,"Patterns/"+ patt_name.value),{
                Colour : patt_color.value
            })
            .then(()=>{
               alert("success");
            })
            .catch(()=>{
               alert("Unsuccessful addition, error:"+error);
            })
        }