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CSS

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HTML 

              
                <section class="intro">      
  <h1>Amazing Product</h1>
  <p class="subtitle">Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptates rem molestias ipsum nulla libero optio.</p>  
  <div class="btn-group"> 
    <a href="#" class="btn btn-accent">Purchase</a>
    <a href="#" class="btn btn-secondary">More info</a>
  </div>
</section>
  

<button id="dark-mode-toggle" class="dark-mode-toggle">
  <svg width="100%" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 496"><path fill="currentColor" d="M8,256C8,393,119,504,256,504S504,393,504,256,393,8,256,8,8,119,8,256ZM256,440V72a184,184,0,0,1,0,368Z" transform="translate(-8 -8)"/></svg>
</button>
<div class="click-here">
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</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css?family=Assistant:400,700|Playfair+Display:900");

*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --clr-light: #fdffc4;
  --clr-dark: #00332a;
  --clr-primary: #dbffa2;
  --clr-secondary: #c3fcf2;
  --clr-accent: #ff7750;

  --foreground: var(--clr-dark);
  --background: var(--clr-light);

  --ff-title: "Playfair Display", serif;
  --ff-body: "Assistant", sans-serif;
}

.darkmode {
  --clr-light: #fdffc4;
  --clr-dark: #00332a;
  --clr-primary: #202302;
  --clr-secondary: #00100d;
  --clr-accent: #ff7750;

  --foreground: var(--clr-light);
  --background: var(--clr-dark);
}


body {
  background: var(--background);
  color: var(--foreground);
  font-family: var(--ff-body);
  font-size: 18px;
  line-height: 1.6;
}

h1 {
  font-size: calc(3rem + 7vw);
  font-family: var(--ff-title);
  margin: 0 0 0.25em;
  line-height: 1;
}

.subtitle {
  max-width: 600px;
}

.btn-group {
  margin: 2em 0;
  display: relative;
}

.btn {
  padding: 1em 2em;
  text-decoration: none;
  text-transform: uppercase;
  border-radius: 5px;
  position: relative;
  display: inline-block;
  line-height: 1;
}

.btn + .btn {
  margin-left: 1em;
}

.btn-secondary {
  background: var(--foreground);
  color: var(--background);
  // border: currentColor solid 2px;
}

.btn-accent {
  background: var(--clr-accent);
  color: var(--foreground);
}

.btn::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  border: var(--foreground) 2px solid;
  left: -4px;
  top: 4px;
  border-radius: inherit;
  z-index: -1;
}

.intro {
  height: 80vh;
  padding: 10em 0;
  display: grid;
  grid-template-columns: minmax(2em, 1fr) minmax(80vw, 860px) minmax(2em, 1fr);
  background: linear-gradient(120deg, var(--clr-primary), var(--clr-secondary));
  align-content: center;
}

.intro > * {
  grid-column: 2 / 3;
}

.dark-mode-toggle {
  position: absolute;
  z-index: 100;
  top: 1em;
  right: 1em;
  color: var(--foreground);
  border: 2px solid currentColor;
  padding: 4px;
  background: transparent;
  cursor: pointer;
  border-radius: 5px;
  width: 30px;
  height: 30px;
}

.click-here {
  // SVG icon from Font Awesome
  width: 100px;
  right: 1.5em;
  position: absolute;
  top: 3em;
}
!

JS 

              
                // check for saved 'darkMode' in localStorage
let darkMode = localStorage.getItem('darkMode'); 

const darkModeToggle = document.querySelector('#dark-mode-toggle');

const enableDarkMode = () => {
  // 1. Add the class to the body
  document.body.classList.add('darkmode');
  // 2. Update darkMode in localStorage
  localStorage.setItem('darkMode', 'enabled');
}

const disableDarkMode = () => {
  // 1. Remove the class from the body
  document.body.classList.remove('darkmode');
  // 2. Update darkMode in localStorage 
  localStorage.setItem('darkMode', null);
}
 
// If the user already visited and enabled darkMode
// start things off with it on
if (darkMode === 'enabled') {
  enableDarkMode();
}

// When someone clicks the button
darkModeToggle.addEventListener('click', () => {
  // get their darkMode setting
  darkMode = localStorage.getItem('darkMode'); 
  
  // if it not current enabled, enable it
  if (darkMode !== 'enabled') {
    enableDarkMode();
  // if it has been enabled, turn it off  
  } else {  
    disableDarkMode(); 
  }
});
!
999px

Console