JSFiddle - React, Tailwind, and code Playground

HTML

<header>
  <div class="container centerAlign">
    <img>
  </div>
</header>
<nav>
  <div class="container centerAlign navContent">
    <img src="hamburger.png" id="hamburger_icon">
    <ul>
      <li>XXX</li>
      <li>XXX</li>
      <li>XXX</li>
    </ul>
  </div>
</nav>
<section class="main-section">
  <div class="leftContent">
    <div class="header" id="innerPageHeadingWrap">
      <P>TITLE SECTION</P>
    </div>
    <div class="question">
      <P>QUESTION SECTION</P>

    </div>
    <div class="buttons">BUTTON SECTION
    </div>
  </div>
  <div class="rightContent">
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
  </div>
</section>
<footer>
  <div class="footerContent container centerAlign">
    <p>sdf sdfsdfsd fdsfsd fsd fsd f sd f sdf sd fsd f dsfsd</p>
    <p>sdf sdfsdfsd fdsfsd fsd fsd f sd f sdf sd fsd f dsfsd</p>
  </div>
</footer>

CSS

body {
  display: flex;
  flex-direction: column;
}

header {
  flex: 0 0 102px;
}

nav {
  flex: 0 0 50px;
}

.main-section {
  flex-grow: 1;
}

footer {
  flex: 1 0 135px;
}


/*----------GLOBAL-------*/

.container {
  width: 97%;
  margin: auto;
  overflow: hidden;
}

.centerAlign {
  text-align: center;
}


/*----------HEADER-------*/

header {
  flex: 0 0 102px;
}

header div img {
  top: 6px;
  position: relative;
}

.logo_mobile {
  display: none;
}

@media only screen and (max-width: 1100px) {
  .logo_mobile {
    display: inline;
    position: relative;
    top: 25px;
  }
  .logo_desktop {
    display: none;
  }
}


/*----------TOPNAV-------*/

nav {
  background-color: #182d3c;
  color: #fff;
  height: 50px;
  border-bottom: 4px solid #ffd100 !important;
}

nav div ul li {
  display: inline;
}

.navContent {
  position: relative;
  top: 6%;
  height: inherit;
}


/*----------MAIN BODY-------*/

html,
body {
  height: 100%;
  overflow-x: hidden;
}

.main-section {
  /* min-height: calc(100% - 291px);
  min-height: -webkit-calc(100% - 291px); */
  display: flex;
}

.header {
  border-bottom: 1px solid #e8e8e8;
}

.question {}

.buttons {
  /* border-top: 1px solid #e8e8e8; */
}


/*---------------RIGHT CONTENT---------------*/

.rightContent {
  overflow: hidden;
  border-left: 1px solid #e8e8e8;
  flex: 2;
}


/*----LEFT CONTENT---*/

.leftContent {
  float: left;
  flex: 7;
}

.header {}

.buttons {}

.question {}


/*----------Footer------*/

footer {
  clear: both;
  position: relative;
  background-color: #e9eef2;
  min-height: 135px;
  width: 100%;
  text-align: center;
}

.footerHead {
  font-weight: 400;
  font-size: 20px;
  color: #606d75;
}


/*-----HAMBURGER_____*/

#hamburger_icon {
  float: left;
  height: 22px;
  width: 22px;
  display: none;
}


/*----RIGHT PANEL MOBILE-----*/

@media only screen and (max-width: 1100px) {
  .leftContent {
    width: 100%;
  }
  .rightContent {
    display: none;
  }
}