creating a new element with addEventListener and innerHTML doesnt work

I’m very new to javascript and I can’t find my mistake. I have an input field and I want to display the value entered in the input field in the section below, once the button is clicked.

I’ve added a click event listener on the button and tried to write a function, which would create a new p element, after the button is clicked, but that doesnt work.

"use strict";

let button = document.getElementById('btn');

button.addEventListener("click", function() {
    let answer = document.createElement('p');
    let input = document.getElementById('input').value;
    answer.innerHTML = "<p>" + input.value;
    console.log('log for testing')
body {
    margin: 0 auto;
    background-color: rgb(149, 199, 255);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;

header {
    background-color: rgb(14, 131, 240);
    height: 170px;
    width: 100%;
    position: fixed;

h2 {
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    letter-spacing: 2px;
    font-size: 30px;

#input {
    display: inline;
    width: 400px;
    border-radius: 8px;
    border: none;
    height: 40px;
    margin-right: 2px;
    padding-left: 8px;
    margin-left: 10px;

#btn {
    font-size: 24px;
    border: none;
    height: 42px;
    width: 42px;
    border-radius: 8px;
    font-weight: 700;
    transition: 0.3s;

#btn:hover {
    cursor: pointer;

#btn:active {
    background-color: rgb(201, 199, 199);

form {
    display: inline-flex;

section div {
    background-color: rgb(157, 157, 240);
    height: 100%;
    width: 444px;
    color: white;
    top: 200px;
    position: fixed;
    margin: 0;
    border-radius: 8px;
    padding: 8px;
    margin-left: 10px;
<!DOCTYPE html>
<html lang="en">
    <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>input to innerHTML</title>
        <h2>Enter your text below</h2>
        <form id="form">    
            <input id="input" type="text" placeholder="Write something here...">
            <button id="btn" type="button"> + </button>
        <div id="answer-section">
            <p></p> <!-- all the answers should go here -->
    <script src="script.js"></script>

Can anybody see my mistake or point me to the right direction? Any help would be much appreciated, thanks.