CodePen Embed - Simple Chat system

<header class="header-class">
  <a href="#default" class="logo">BLACKOUT STUDIO</a>
  <div class="header-right">
    <a class="active" href="#home">Home</a>
    <a href="#contact">Contact</a>
    <a href="#about">About</a>
  </div>
</header>
<main>
  <div class="container">
    <div class="cont-window">

      <div class="conv-wrapper">
        <div id="conv-cont">
          <div class="chat-info">
            <div class="chat-pic">
              <img alt="img_profile" src="https://img.icons8.com/plasticine/100/000000/person-male.png" />
            </div>
            <div class="chat-name">
              Aswin Tommy
            </div>
          </div>
          <div class="conv conv-left">
            <div class="conv-bubble">
              <div class="msg-info">
                <div class="msg-info-name">
                  Aswin
                </div>
                <div class="msg-info-time">
                  20:11
                </div>
              </div>
              <div class="msg-text">
                Courier New is the most widely used monospace serif font.
                New is also the standard font for movie screenplays.
              </div>
            </div>
          </div>
        </div>
        <div id="msg-box-cont">
          <div class="msg-btn-cont">
            <form class="chat-form">
              <input type="text" class="chat-input" placeholder="Enter your message...">
              <button type="submit"><img alt="icon_send" src="https://img.icons8.com/ios/50/000000/send-letter--v1.png" /></button>
            </form>
          </div>
        </div>
      </div>

    </div>
    <div class="cont-ls-cont">
      <div class="cont-list">
        <div class="chat-cont-img">
          <img alt="img_profile" src="https://img.icons8.com/plasticine/100/000000/person-male.png" />
        </div>
        <div class="chat-cont-img">
          <img alt="img_profile" src="https://img.icons8.com/plasticine/100/000000/person-male.png" />
        </div>
        <div class="chat-cont-img">
          <img alt="img_profile" src="https://img.icons8.com/plasticine/100/000000/person-male.png" />
        </div>
        <div class="chat-cont-img">
          <img alt="img_profile" src="https://img.icons8.com/plasticine/100/000000/person-male.png" />
        </div>
        <div class="chat-cont-img">
          <img alt="img_profile" src="https://img.icons8.com/plasticine/100/000000/person-male.png" />
        </div>
        <div class="chat-cont-img">
          <img alt="img_profile" src="https://img.icons8.com/plasticine/100/000000/person-male.png" />
        </div>
        <div class="chat-cont-img">
          <img alt="img_profile" src="https://img.icons8.com/plasticine/100/000000/person-male.png" />
        </div>
      </div>
    </div>
  </div>
</main>

<!-- Footer -->
<footer class="footer-class">
  <p>
  <p> <tt> © COPYRIGHT BLACKOUT 2020 | ALL RIGHT RESERVED </tt> </p>
  </p>

</footer>
<script type="text/javascript" src="main.js"></script>

html,
body {
  background-color: white;
  margin: 0;
  padding: 0%;
  height: 100%;
  align-items: center;
}

li {
  display: inline;
  text-decoration: none;
  color: aliceblue;
}

/* Scroll Bar */
::-webkit-scrollbar {
  width: 5px;
}

::-webkit-scrollbar-track {
  box-shadow: inset 0 0 2px grey;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb {
  background: dimgray;
  border-radius: 1px;
}

/* Header */
.header-class {
  overflow: hidden;
  background-color: #080000;
  padding: 20px 10px;
}

.header-class a {
  float: left;
  color: #fffbf0;
  text-align: center;
  padding: 12px;
  text-decoration: none;
  font-size: 18px;
  line-height: 25px;
  border-radius: 1px;
}

.header-class a.logo {
  font-size: 25px;
  font-weight: bold;
}

.header-class a:hover {
  background-color: #282828;
  color: #fffbf0;
}

.header-class a.active {
  background-color: #480000;
  color: white;
}

.header-right {
  float: right;
}

/*when the screen is 500px wide or less, stack the links on top of each other */
@media screen and (max-width: 450px) {
  .header-class a {
    float: none;
    display: block;
    text-align: left;
    padding: 10px;
    font-size: 14px;
    line-height: 15px;
  }
  .header-class a.logo {
    font-size: 20px;
  }
  .header-right {
    float: none;
  }
  ::-webkit-scrollbar {
    width: 3px;
  }
}

/*chat window*/
.container {
  margin: auto;
  position: fixed;
  width: 65%;
  height: 64%;
  transform: translateY(1%);
  -ms-transform: translateY(1%);
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}
.cont-window {
  height: 100%;
  width: 86%;
  float: left;
  position: relative;
  border: 2px solid black;
  background: white;
  box-shadow: 0 15px 15px -5px rgba(0, 0, 0, 0.2);
}

.cont-ls-cont {
  float: right;
  border: 2px solid black;
  background: white;
  width: 11%;
  height: 100%;
  box-shadow: 0 15px 15px -5px rgba(0, 0, 0, 0.2);
  overflow-y: scroll;
  overflow-x: hidden;
}

input[type="text"],
select,
textarea {
  width: 60%;
  padding: 12px;
  border: 1px solid black;
  border-radius: 4px;
  box-sizing: border-box;
  resize: vertical;
}

.conv-wrapper {
  display: flex;
  flex-flow: column wrap;
  justify-content: space-between;
  width: 100%;
  margin-top: 0px;
  overflow: hidden;
  height: 100%;
}

#conv-cont {
  flex: 1;
  overflow-y: scroll;
  width: 100%;
}

.chat-info {
  height: auto;
  width: fit-content;
  display: flex;
  margin-bottom: 7px;
  margin-top: 5px;
  background-color: #071b2f;
  border-radius: 50px;
  border-bottom-left-radius: 0;
  border-top-left-radius: 0;
}

.chat-pic {
  width: 50px;
  height: 50px;
  align-items: center;
  transform: translateY(-0px);
  background: rgb(255, 255, 255);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  border-radius: 50%;
  order: 2;
  border: 5px solid #071b2f;
  margin-left: 5px;
}

.chat-pic img {
  width: 100%;
  height: auto;
}

.chat-name {
  display: inline-block;
  vertical-align: top;
  color: #fffbf0;
  background-color: #071b2f;
  height: 90%;
  padding: 10px;
  width: 150px;
  font-family: "Nunito";
}

.conv {
  display: flex;
  align-items: flex-end;
}

.conv-right {
  flex-direction: row-reverse;
}

.conv-right .conv-bubble {
  max-width: 70%;
  padding: 12px;
  right: 0;
  margin-right: 7px;
  margin-bottom: 2px;
  padding-bottom: 2px;
  border-radius: 15px;
  color: lightgrey;
  background-color: #071b2f;
  border-top-right-radius: 0;
}

.conv-left .conv-bubble {
  margin-bottom: 2px;
  max-width: 70%;
  padding: 12px;
  border-radius: 15px;
  margin-left: 7px;
  background-color: lightgray;
  border-top-left-radius: 0;
}

.msg-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.msg-info-name {
  font-weight: bold;
  margin-right: 10%;
  font-size: medium;
  font-family: "Nunito";
}

.msg-info-time {
  font-size: small;
}

.msg-text {
  margin: 0;
  margin-bottom: 3px;
  font-family: "Fuzzy Bubbles";
  font-size: 16px;
}

#msg-box-cont {
  position: relative;
  width: 100%;
  bottom: 0;
  padding: 0;
  margin-top: 5px;
  background-color: #200000;
  border: 1px solid black;
}

.msg-btn-cont {
  padding: 3px;
  position: relative;
  background-color: black;
}

.msg-btn-cont input {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  border: 2px;
  border-radius: 18px;
}

.msg-btn-cont button {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  margin: 4px;
  border-radius: 25px;
  padding: 0;
  border: 0;
  overflow: hidden;
}

.msg-btn-cont img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cont-list {
  height: auto;
  width: 100%;
}
.chat-cont-img {
  border-bottom: 0.5px solid grey;
  width: 100%;
  height: 100px;
  padding: 3px;
  padding-top: 5px;
}
.cont-list img {
  border-bottom: 0.5px solid grey;
  display: block;
  width: auto;
  height: 90px;
  border-radius: 50%;
  margin-left: auto;
  margin-right: auto;
}
.cont-list :hover {
  background-color: lightgrey;
}

@media screen and (max-width: 450px) {
  .cont-window {
    height: 50%;
    width: 94%;
    transform: translateY(16%);
    -ms-transform: translateY(16%);
  }

  .conv-wrapper {
    height: 86%;
  }
  .conv-bubble {
    max-width: 60%;
  }
  .msg-text {
    font-size: small;
  }
  .msg-info {
    margin-bottom: 3px;
  }
  .msg-info-name {
    font-size: small;
  }
  .msg-info-time {
    font-size: x-small;
  }
  .conv-right .conv-bubble {
    margin-right: 3px;
  }
  .conv-left .conv-bubble {
    margin-right: 3px;
  }
  .chat-name {
    width: 110px;
    font-size: small;
  }
}

/* Footer*/
.footer-class {
  color: aliceblue;
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 15%;
  background-color: #080000;
  text-align: center;
}

.footer-class p {
  font-size: 18px;
}

@media screen and (max-width: 450px) {
  .footer-class p {
    font-size: 12px;
  }
}

const chatCont = document.querySelector("#conv-cont");
const chatForm = document.querySelector(".chat-form");
const chatInput = document.querySelector(".chat-input");

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

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

  appendMessage(msgText);
  chatInput.value = "";
});
function appendMessage(text) {
  const msgHTML = `
  <div class="conv conv-right">
  <div class="conv-bubble">
      <div class="msg-info">
          <div class="msg-info-name">
              John
          </div>
          <div class="msg-info-time">
              20:11
          </div>
      </div>
      <div class="msg-text">
          ${text}
      </div>
    </div>
  </div>
    `;
  chatCont.insertAdjacentHTML("beforeend", msgHTML);
  chatCont.scrollTop += 100;
}

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