Crear un input con width: 200px height: 200px con un boton de width: 50px height: 50px, al tocar el botón reemplazar un texto que está en el input y después devolver el valor y añadirlo en el input's game

<button id="changeButton" onclick="cambiarTexto()">Cambiar</button>

function cambiarTexto() {
            var input = document.getElementById("inputText");
            var texto = input.value;
            
            var tex = texto.replace( "a", "e" );
            input.innerHTML = tex;
        }
    
</script>
<br>
</div></div><div id='footerHisa' style='z-index:1003;background-color:#5592FD;display:flex;justify-content:space-between;padding:6px;position:relative;font-size:14px;'><a href="?dev_uid=O0RfUGb2HwIUgc0q8v1uOQ==&pt=devID&id=33022&uid=D591425_WKrh">←<img class="hisa" src="IconGame.png" id="s16" style="vertical-align:middle;">Prev</a>　<a href="?dev_uid=O0RfUGb2HwIUgc0q8v1uOQ==&pt=devID&id=33025&uid=D591425_WKrh">Next<img class="hisa" src="IconGame.png" id="s16" style="vertical-align:middle;">→</a> 　<a href="AIGameCreator.php?dev_uid=O0RfUGb2HwIUgc0q8v1uOQ==&id=33024&pt=devID&" style="vertical-align:middle;"><img class="hisa" src="IconBack.png" id="s14" style="vertical-align:middle;"> Back</a>　<a href="javascript:good();" style="vertical-align:middle;"><span id="good"><img class="hisa" src="IconHeart_w.png" id="s14" style="vertical-align:middle;">  0</span></a>　<a href="javascript:BM();" style="vertical-align:middle;"><span id="BM"><img class="hisa" src="IconBM.png" id="s14" style="vertical-align:middle;">  0</span></a>　<span id="menu"><a href="javascript:menu();" style="vertical-align:middle;"><img class="hisa" src="IconMenu.png" id="s14" style="vertical-align:middle;" alt="Menu"></a>　</span></div><div id="vKeyHisa2" style='z-index:1000;position:fixed;bottom:100;width:100%;text-align:center;display:flex;justify-content:space-between; user-select: none; -webkit-user-select: none; -moz-user-select: none; margin:0px;padding:0px;'>
</div>
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    </div><br>
<div style="margin-top:30px;font-size:11px;line-height:18px;text-align:center" id="footerHisa"><a href="javascript:dev_post();" style="text-decoration:none;color:#FFF;">(C)2023 HisashiApp</a><br></div><br><br><br><br></body></html><br>
<script>

//alert(screen.width+"/"+screen.height);//412/915

var _block_s = "block";
var _report_s = "Report";
var _del_s = "Delete";
var _private_s = "Public/private";
var _RequestDelete_s = "Do you want to delete this game?";
var _RequestReport_s = "Would you like to report this game?";
var _RequestBlock_s = "Do you block this game?";
var _deleted_s = "It has been deleted!";
var _blocked_s = "I blocked it!";
var _reported_s = "Reported!";

var _change_public_s = "Do you change this game to the public?";
var _change_private_s = "Do you change this game private?";
var _changed_public_s = "Changed to the public!";
var _changed_private_s = "Changed private!";

var _good = 0;
var _BM = 0;
var _isMyGame = false;
var _id = "33024";
var _langBase = "es";
var _nowLang = "en";

var _uid = "D591425_WKrh";
var _isMyBukuma = false;
var _isMyFab = false;
var _isPrivate = false;

//let vKeyHisa = document.getElementById("vKeyHisa");
let footerHisa = document.getElementById("footerHisa");
//let _clientRect = vKeyHisa.getBoundingClientRect() ;

//vKeyHisa.style.top = -screen.height*0.2;//-100;//-window.innerWidth;//(screen.height) + "px";

//vKeyHisa.style.zIndex = 999;
//footerHisa.style.zIndex = 1000;

/*
window.onscroll = function () {
    if(_isKeyDownHisa || !vKeyHisa){
        return;
    }

let headerH = document.getElementsByClassName('header')[0].clientHeight; // headerの高さを取得
  let side_authorH = document.getElementsByClassName('side_author')[0].clientHeight; // 一つ目サイドバーの高さを取得
  let side_searchH = document.getElementsByClassName('side_search')[0].clientHeight; // 二つ目のサイドバーの高さを取得
  let side_categoryH = document.getElementsByClassName('side_category')[0].clientHeight; // 三つ目のサイドバーの高さを取得
　// 上で取得した高さを合計する
  let totalH = headerH + side_authorH + side_searchH + side_categoryH;
  // 追従させたい要素のクラス名を取得する
  let side_adv = vKeyHisa;//document.getElementsByClassName('side_adv')[0];

//vKeyHisa.style.zIndex = 999;
//footerHisa.style.zIndex = 1000;
//vKeyHisa.style.top = (goalY) + "px";//goalY + "px";

// 画面に追従するサイドバーの実装
  // 画面の幅が991px以下の場合は実行されないようにする
  if (window.innerWidth >= 991){
    // 追従したいサイドバーのところまできたら追従する
    if (window.pageYOffset >= totalH) {
      // 追従機能に使用するCSSを設定
      side_adv.classList.add('fixed'); 
    } else {
      // 追従が必要無い箇所では追従CSSをはずず
      side_adv.classList.remove('fixed');
    }
  }
}*/

</script>
<script src="View.js?1689746840"></script>

<textarea id="hisa_textarea2" style="display:none"><!DOCTYPE html>
<html>
<head>
    <title>Juego de Cambio de Texto</title>
    <style>
        input {
            width: 200px;
            height: 200px;
        }
        
        button {
            width: 50px;
            height: 50px;
        }
    </style>
</head>
<body>
    <textarea class="input" id="inputText">
    <button id="changeButton" onclick="cambiarTexto()">Cambiar</button>