i have created a courses page and create a fullscreen which should be opened when button is clicked modal is also opened but i am having an error in JS.
let value = colc[details.target.id]

if(details.target.tagName == "BUTTON"){

       

        fullscreen.style.opacity = 1;
        fullscreen.style.pointerEvents = "auto";

       inData = `<div id="fsCard">
                <h1>${value.heading}</h1>
                </div>
            `
     
}
   i am having error in value.heading 

i tried to create a modal which should be opened when button is clicked and it is opening but modal dont contain a card which i have created in event listener