TOP Etch-a-sketch grid resizing – Blancer.com Tutorials and projects

I’m trying to complete The Odin Project’s Etch-a-Sketch challenge and am currently stuck with trying to resize the divs that make up the sketchpad. The app creates a 16×16 grid by default, and when pressing the erase button it asks for a number. It should then recreate the grid based on that number. However, the size of the pad goes all wonky. Link to codepen for clarification: https://codepen.io/eerolli/pen/abELQbp

Any help is much appreciated.

Edit: It should probably be noted, that the app works fine when I enter a number equal to or lower than 16.

html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css">
    <title>Etch-a-Sketch</title>
</head>
<body>
    <div class="content">
        <h1>Etch-a-Sketch</h1>
        <div class="container">

        </div>
        <button>Erase</button>
    </div>
</body>
<script src="script.js"></script>
</html>

javascript:

let clear = document.querySelector("button");

//function to create a 16x16 grid
function createGrid(size){
    function resetSize(){
        clear.addEventListener('click', ()=>{
            let number = prompt("What size would you like the grid to be? (1-100)");
            container.style.gridTemplateRows = `repeat(${number}, 1fr)`;
            container.style.gridTemplateColumns = `repeat(${number}, 1fr)`;
        })
        
        
    }
    resetSize();

    let container = document.querySelector(".container");
    container.style.gridTemplateRows = `repeat(${size}, 1fr)`;
    container.style.gridTemplateColumns = `repeat(${size}, 1fr)`;
    
    for (let i = 0; i < size*size; i++) {
        
        let square = document.createElement("div");
        square.style.backgroundColor = "black";
        container.appendChild(square);

        //change background color of a square on hover
        square.addEventListener('mouseover', e=>{
            square.style.backgroundColor = "white";
        })


        //function to reset the grid
        function clearGrid(){
            clear.addEventListener('click', e=>{
                square.style.backgroundColor = "black"
           })
        }
        

        clearGrid();    
    }
}

createGrid(16);