【解決方法】小さな画面でチャット ボックスを応答させるときに問題が発生する

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チャット ボックス UI の開発に取り組んでいますが、小さな画面で応答性を高めるのに苦労しています。 チャット セクションの応答性を高めたいと考えています。つまり、画面サイズに合わせてレイアウトを自動的に調整する必要があります。 主な目標は、小さな画面で、ユーザーが送信ボタンなどのさまざまな要素 (主に水平スクロール) にアクセスするために水平スクロールする必要がないようにすることです。
コードは次のとおりです

HTML
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.1/css/all.min.css" integrity="sha512-MV7K8+y+gLIBoVD59lQIYicR65iaqukzvf/nwasF0nqhPay5w/9lJmVM2hMDcnK1OnMGCdVK+iQrJ7lzPJQd1w==" crossorigin="anonymous" referrerpolicy="no-referrer" />
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/boxicons@latest/css/boxicons.min.css">
    <title>Chat Box</title>
</head>
<style>
*{
  margin: 0;
  padding: 0;
}
:root {
  --body-bg: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  --msger-bg: #fff;
  --border: 2px solid #ddd;
  --left-msg-bg: #ececec;
  --right-msg-bg: #579ffb;
}


.mncht,
.mncht:before,
.mncht:after{
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}
.mncht{
    box-sizing: border-box;
   margin: 5px auto;
   height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 5px;
  background-image: var(--body-bg);
  font-family: Helvetica, sans-serif;
}
.msger {
  display: flex;
  flex-flow: column wrap;
  justify-content: space-between;
  width: 100%;
  max-width: 867px;
  margin: 25px 10px;
  height: calc(100% - 50px);
  border: var(--border);
  border-radius: 5px;
  background: var(--msger-bg);
  box-shadow: 0 15px 15px -5px rgba(0, 0, 0, 0.2);
}

.msger-header {
  display: flex;
  justify-content: space-between;
  padding: 10px;
  border-bottom: var(--border);
  background: #eee;
  color: #666;
}
.msger-header-title{
  margin: 2px;
  padding: 5px;
}
.nofs{
  margin: 2px;
}
.msger-chat {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}
.msger-chat::-webkit-scrollbar {
  width: 6px;
}
.msger-chat::-webkit-scrollbar-track {
  background: #ddd;
}
.msger-chat::-webkit-scrollbar-thumb {
  background: #bdbdbd;
}
.msg {
  display: flex;
  align-items: flex-end;
  margin-bottom: 10px;
}
.msg:last-of-type {
  margin: 0;
}
.msg-img {
  width: 50px;
  height: 50px;
  margin-right: 10px;
  background: #ddd;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  border-radius: 50%;
}
.msg-bubble {
  max-width: 450px;
  padding: 14px;
  border-radius: 14px;
  background: var(--left-msg-bg);
}
.msg-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 9px;
}
.msg-info-name {
  font-size: 0.89em;
  margin-right: 10px;
  font-weight: bold;
}
.msg-info-time {
  font-size: 0.75em;
}
.msg-text{
  word-wrap: break-word;
  font-size: 0.81em;
}
.left-msg .msg-bubble {
  border-bottom-left-radius: 0;
}
.msg-bubble {
    width: 55%;
}
.right-msg {
  flex-direction: row-reverse;
}
.right-msg .msg-bubble {
  background: var(--right-msg-bg);
  color: #fff;
  border-bottom-right-radius: 0;
}
.right-msg .msg-img {
  margin: 0 0 0 10px;
}

.msger-inputarea {
  width: 100%;
  display: flex;
  padding: 10px;
  border-top: var(--border);
  background: #eee;
}
.msger-inputarea * {
  padding: 2px;
  border: none;
  border-radius: 3px;
  font-size: 0.91em;
}
.msger-input {
  padding: 20px;
  flex-grow: 1;
  margin: 10px auto;
  background: #ddd;
}
.msger-send-btn {
  border-radius: 8px;
  padding: 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  margin-left: 3px;
  color: #000000;
  font-weight: bold;
  cursor: pointer;
  font-size: 23.4px;

  transition: background 0.23s;
}
.msger-send-btn:hover {
  background-color: #0e8859;
}

.msger-send-btn-mg {
    margin-left: -7px !important;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    padding: 15px !important;
    margin: 13px 2.8px auto;
    font-size: 23px;
    height: 77%;
    width: 8%;
    color: #000000;
    border-radius: 7px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    position: relative;
    overflow: hidden;
}
.msger-send-btn-mg:hover{
  background-color: #0e8859;
}
.msger-send-btn-mg i {
    margin-right: 2px;
}

.msger-send-btn-mg input {
    position: absolute;
    top: 0;
    left: 0;
    width: 10%;
    height: 80%;
    opacity: 0;
    cursor: pointer;
}

.msger-send-btn-mg:hover {
    background-color: #0e8859;
}

.error {
    color: red;
    margin-top: 10px;
}

.hidden {
    display: none;
}

.snd-btn{
  margin-right: -8px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}
.ext-cr{
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px;
  border-radius: 8px;
  width: 100%;
  font-size: 21px;
  cursor: pointer;
}
.ext-cr:hover{
  background:#52a4c5;
}
.ext-cr:focus{
  background:#36768f;
}
.msger-chat {
  background-color: #fcfcfe;
  /* background-image:  */
}

@media only screen and (max-width: 420px) {
  .msger-send-btn-mg{
    margin-left: -6px;
    width: 12%;
    padding: 12px !important;
    font-size: 21px;
  }
  .msger-send-btn{
    font-size: 22px;
  }
}
</style>
<body>
    <div class="mncht">
    <section class="msger">
        <header class="msger-header">
          <div class="msger-header-title">
            <i class="fas fa-comment-alt nofs"></i>&nbsp; &nbsp; Chat Kura
          </div>
          <div class="msger-header-options">
            <span class="ext-cr" id="open-modal"><i class="fa-regular fa-circle-xmark"></i></span>
          </div>
        </header>
      
        <main class="msger-chat">
          <div class="msg left-msg">
            <div
             class="msg-img"
             style="background-image: url(https://image.flaticon.com/icons/svg/327/327779.svg)"
            ></div>
      
            <div class="msg-bubble">
              <div class="msg-info">
                <div class="msg-info-name">Your name</div>
                <div class="msg-info-time">Message Time</div>
              </div>
      
              <div class="msg-text">
                You can change your name in JS section!
              </div>
            </div>
          </div>
      
          <div class="msg right-msg">
            <div
             class="msg-img"
             style="background-image: url(https://image.flaticon.com/icons/svg/145/145867.svg)"
            ></div>
      
            <div class="msg-bubble">
              <div class="msg-info">
                <div class="msg-info-name">Your Name</div>
                <div class="msg-info-time">Message Time </div>
              </div>
      
              <div class="msg-text">
                You can change your name in JS section!
              </div>
            </div>
          </div>
        </main>
      
        <form class="msger-inputarea">
            <button class="msger-send-btn-mg">
        <i class="far fa-images" id="thfn"></i>
        <input type="file" id="imageInput" accept="image/*" onchange="validateImage()">
    </button>
    <p id="errorText" class="error hidden">File size exceeds the limit (2MB).</p>
          <input type="text" class="msger-input" placeholder="Enter your message...">
          <div class="snd-btn">
          <button type="submit" class="msger-send-btn"><i class="fas fa-paper-plane"> </i> &nbsp;
          </button> </div>
        </form>
      </section>
    </div>

    
    <script>
const msgerForm = get(".msger-inputarea");
const msgerInput = get(".msger-input");
const msgerChat = get(".msger-chat");

const BOT_MSGS = [
  "Hi, how are you?",
  "Ohh... I can't understand what you trying to say. Sorry!",
  "I like to play games... But I don't know how to play!",
  "Sorry if my answers are not relevant. :))",
  "I feel sleepy! :("
];

// Icons made by Freepik from www.flaticon.com
const BOT_IMG = "https://image.flaticon.com/icons/svg/327/327779.svg";
const PERSON_IMG = "https://image.flaticon.com/icons/svg/145/145867.svg";
const BOT_NAME = "BOT";
const PERSON_NAME = "Sajad";

msgerForm.addEventListener("submit", event => {
  event.preventDefault();

  const msgText = msgerInput.value;
  if (!msgText) return;

  appendMessage(PERSON_NAME, PERSON_IMG, "right", msgText);
  msgerInput.value = "";

  botResponse();
});

function appendMessage(name, img, side, text) {
  //   Simple solution for small apps
  const msgHTML = `
    <div class="msg ${side}-msg">
      <div class="msg-img" style="background-image: url(${img})"></div>

      <div class="msg-bubble">
        <div class="msg-info">
          <div class="msg-info-name">${name}</div>
          <div class="msg-info-time">${formatDate(new Date())}</div>
        </div>

        <div class="msg-text">${text}</div>
      </div>
    </div>
  `;

  msgerChat.insertAdjacentHTML("beforeend", msgHTML);
  msgerChat.scrollTop += 500;
}

function botResponse() {
  const r = random(0, BOT_MSGS.length - 1);
  const msgText = BOT_MSGS[r];
  const delay = msgText.split(" ").length * 100;

  setTimeout(() => {
    appendMessage(BOT_NAME, BOT_IMG, "left", msgText);
  }, delay);
}

// Utils
function get(selector, root = document) {
  return root.querySelector(selector);
}

function formatDate(date) {
  const h = "0" + date.getHours();
  const m = "0" + date.getMinutes();

  return `${h.slice(-2)}:${m.slice(-2)}`;
}

function random(min, max) {
  return Math.floor(Math.random() * (max - min) + min);
}
 
    </script>
<script>
    function validateImage() {
            const fileInput = document.getElementById("imageInput");
            const errorText = document.getElementById("errorText");
            const maxSize = 2 * 1024 * 1024; // 2MB

            if (fileInput.files.length > 0) {
                const fileSize = fileInput.files[0].size;
                if (fileSize > maxSize) {
                    errorText.style.display = "block";
                } else {
                    errorText.style.display = "none";
                }
            }
        }
</script>
<script src="main.js"></script>
</body>
</html>

私が試したこと:

CSS でレイアウトを調整するためにいくつかのメディア クエリを追加しようとしましたが、応答性のレベルに達していません。

CSS
@media only screen and (max-width: 420px) {
  .msger-send-btn-mg{
    margin-left: -6px;
    width: 12%;
    padding: 12px !important;
    font-size: 21px;
  }
  .msger-send-btn{
    font-size: 22px;
  }
}

助けてくれてありがとう、 ;） 。

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