JSFiddle - React, Tailwind, and code Playground

HTML

<header>
    <h1>click to open/close</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  </header>

CSS

h1 {
  color: #e55a55;
  font-size: 20px;
}

header {
  border-bottom: 1px solid #ccc;
  margin-bottom: 50px;
  padding: 20px 40px;
}

header h1:hover {
  cursor: pointer;
}

header p {
  width: 380px;
  font-size: 14px;
  float: left;
  display: none;
}

JavaScript

$('header h1').mouseenter(function() {
  $('header:not(.open)').delay(500).animate({
    'padding-bottom': '40px'
  }, 150, function() {
    //function complete
  });
});

$('header h1').mouseleave(function() {
  $('header:not(.open)').animate({
    'padding-bottom': '20px'
  }, 150, function() {
    //function complete
  });
});

$('header h1').click(function() {
  
  if ($('header').hasClass('open')) {
    $('header p').fadeOut(100);
    $('header').removeClass('open').animate({
      'padding-bottom': '20px'
    }, 300, function() {
      //animation complete
    });
  }
  
  else {
    $('header').addClass('open').animate({
      'padding-bottom': '150px'
    }, 300, function() {
      $('header p').fadeIn();
    });
  }
  
});