Replacing element in html/css

I have the following contact form:

/* Contact Form */

input[type=text],
[type=email],
select,
textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #555;
  margin-top: 6px;
  margin-bottom: 16px;
  resize: vertical;
}

input[type=submit] {
  background-color: #0563bb;
  color: white;
  padding: 12px 20px;
  border: none;
  cursor: pointer;
}

input[type="text"]:focus,
input[type="email"]:focus,
#subject:focus {
  background: var(--bgFormElsFocus);
  transform: scale(1.02);
  transition: transform 0.2s ease-in-out;
}

input[type=submit]:hover {
  opacity: 0.9;
}

.contactform {
  position: relative;
  border-radius: 50px;
  background-color: #f2f2f2;
  padding: 5px;
  z-index: 2;
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: auto;
  margin-top: 1%;
  width: 100%;
  animation-name: gradient;
  animation-duration: 3s;
  animation-iteration-count: infinite;
}

.contactform:hover {
  animation-name: gradient;
  animation-duration: 15s;
  animation-iteration-count: infinite;
}

.column {
  float: center;
  width: 50%;
  margin-top: 6px;
  padding: 20px;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.row:after {
  content: "";
  display: table;
  clear: both;
}

@media screen and (max-width: 600px) {
  .column,
  input[type=submit] {
    width: auto;
    margin-top: 0;
  }
}

.shakingErr {
  border-color: red;
  animation: shake 0.82s forwards;
}

@keyframes shake {
  10%,
  90% {
    transform: translate3d(-1px, 0, 0);
  }
  20%,
  80% {
    transform: translate3d(2px, 0, 0);
  }
  30%,
  50%,
  70% {
    transform: translate3d(-4px, 0, 0);
  }
  40%,
  60% {
    transform: translate3d(4px, 0, 0);
  }
}

<!-- start contact section -->
<section id="contact">
  <div class="container" data-aos="fade-up">
    <div class="contactform">
      <div style="text-align:center">
        <div class="section-title">
          <h2><br/>Get In Touch</h2>
        </div>
        <p>Feel Free To Reach Out To Me Through This Form! </p>
      </div>
      <div class="row">
        <div class="column">
          <form name="myform" action="https://formspree.io/f/xrg123232jbqpq" id="my-form" method="POST" novalidate>
            <label for="firstname">First Name</label>
            <input type="text" id="first name" name="firstname" placeholder="Your First Name.." required>
            <label for="lastname">Last Name</label>
            <input type="text" id="lastname" name="lastname" placeholder="Your Last Name.." required>
            <label for="email">Email:</label>
            <input type="email" id="email" name="email" placeholder="Your Email.." required>
            <label for="subject">Subject</label>
            <textarea id="subject" name="subject" placeholder="Lets Collaborate.." style="height:170px" required></textarea>
            <input type="submit" value="Submit">
          </form>
        </div>
      </div>
    </div>
  </div>
</section>
<!-- End Contact Section -->

Basically, I would like to change the Submit button and replace it with this button:

var basicTimeline = anime.timeline({
  autoplay: false
});

var pathEls = $(".check");
for (var i = 0; i < pathEls.length; i++) {
  var pathEl = pathEls[i];
  var offset = anime.setDashoffset(pathEl);
  pathEl.setAttribute("stroke-dashoffset", offset);
}

basicTimeline
  .add({
    targets: ".text",
    duration: 1,
    opacity: "0"
  })
  .add({
    targets: ".button",
    duration: 1300,
    height: 20,
    width: 300,
    backgroundColor: "#2B2D2F",
    border: "0",
    borderRadius: 100
  })
  .add({
    targets: ".progress-bar",
    duration: 2000,
    width: 300,
    easing: "linear"
  })
  .add({
    targets: ".button",
    width: 0,
    duration: 1
  })
  .add({
    targets: ".progress-bar",
    width: 80,
    height: 80,
    delay: 500,
    duration: 750,
    borderRadius: 80,
    backgroundColor: "#71DFBE"
  })
  .add({
    targets: pathEl,
    strokeDashoffset: [offset, 0],
    duration: 200,
    easing: "easeInOutSine"
  });

$(".button").click(function() {
  basicTimeline.play();
});

$(".text").click(function() {
  basicTimeline.play();
});

body {
  background: #1D1F20;
}
main {
  height: 100vh;
  width: 100vw;
}

.button {
  background: #2B2D2F;
  height: 80px;
  width: 200px;
  text-align: center;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  left: 0;
  right: 0;
  margin: 0 auto;
  cursor: pointer;
  border-radius: 4px;
}

.text {
  font: bold 1.25rem/1 poppins;
  color: #71DFBE;
  position: absolute;
  top: 50%;
  transform: translateY(-52%);
  left: 0;
  right: 0;
}

.progress-bar {
  position: absolute;
  height: 20px;
  width: 0;
  right: 0;
  top: 50%;
  left: 50%;
  border-radius: 200px;
  transform: translateY(-50%) translateX(-50%);
  background: lighten(#2B2D2F, 15%);
}

svg {
  width: 30px;
  position: absolute;
  top: 50%;
  transform: translateY(-50%) translateX(-50%);
  left: 50%;
  right: 0;
}

.check {
  fill: none;
  stroke: #FFFFFF;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

<link href="https://fonts.googleapis.com/css?family=Poppins:600" rel="stylesheet">
<script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/2.0.2/anime.js"></script>
<script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>

<main>
  <div class="button">
    <div class="text">Submit</div>
  </div>
  <div class="progress-bar"></div>
  <svg x="0px" y="0px"
     viewBox="0 0 25 30" style="enable-background:new 0 0 25 30;">
    <path class="check" class="st0" d="M2,19.2C5.9,23.6,9.4,28,9.4,28L23,2"/>
  </svg>
</main>

I'm looking to just replace the contact form button with the new button that I have in the code above. It should be the exact size, width and height as the previous Submit button that I currently have in the contact form. Any suggestions on how I can accomplish this? Thanks a lot.

The code might seem long but the only class or property that controls the button in the contact form is this:

input[type=submit] {
  background-color: #0563bb;
  color: white;
  padding: 12px 20px;
  border: none;
  cursor: pointer;
}

from Replacing element in html/css