JSFiddle - React, Tailwind, and code Playground

HTML

<section class="section-one">
  <div class="container">
    <h1>Page one</h1>
      <button class="button-one">Go To Page Two</button>

  </div>
</section>
<section class="section-two">
  <div class="container">
    <h1>Page two</h1>
      <button class="button-two">Go To Page one</button>

  </div>
</section>

CSS

body {
  text-align: center; 
  padding: 0;
  margin: 0;
}

h1 {
  font-size: 50px; 
  text-align: center
}

section {
  padding: 30px 0;
  margin: 0;
  position: absolute;
  overflow: hidden;
  height: 100vh; 
  top: 0;
  left: 0;
}
.section-one {
  background: #4089A6;
  height: 100vh;  width: 100%;
  z-index: 99;
  border-top: 1px solid #4089A6;
  border-bottom: 1px solid #4089A6;
}
.section-two {
  background: #3bb17c;
  height: 2px;
  padding: 0;
  top: 50vh;
  left: 50%;
  width: 5px;
  display: none;
  border-top: 1px solid #3bb17c;
  border-bottom: 1px solid #3bb17c;
}
button {  
  padding: 10px 35px;
  border: none;
  background: #fff;
  font-size: 15px;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;
  border-bottom: 2px solid #ddd;
  color: #4089A6;
  font-weight: 400;
  text-transform: uppercase;
  cursor: pointer
}

JavaScript

"use strict";

var section1  = $(".section-one"),
    section2 = $(".section-two");

$(".button-one").click(function () {

    section1.animate({
        'height': '0',
        'top': '50vh',
        'padding': '0'
    }, 300)
    .animate({
        'width': '2px',
        'left': '50%'
    }, 900)
    .fadeOut(200, function () {
        section2.fadeIn(200);
        section2.animate({
            'width': '100%',
            'left': '0'
        }, 900);
        section2.animate({
            'min-height': '100vh',
            'top': '0',
            'padding-top': '50px',
            'padding-bottom': '50px'
        }, 300);
    });
});

$(".button-two").click(function () {

    section2.animate({
        'min-height': '0',
        'height': '0',
        'top': '50vh',
        'padding': '0'
    }, 300)
    .animate({
        'width': '2px',
        'left': '50%'
    }, 900)
    .fadeOut(200, function () {
        section1.fadeIn(200)
        .animate({
            'width': '100%',
            'left': '0'
        }, 900)
        .animate({
            'height': '100vh',
            'top': '0',
            'padding-top': '100px',
            'padding-bottom': '100px'
        }, 300);
    });
});