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HTML

              
                <body class="bg-white dark:bg-gray-900">
    <div class="flex w-full justify-around items-center bg-gray-100 dark:bg-gray-900 text-gray-900 dark:text-white py-5">
        <div class="theme-switcher">
            <button class="theme-switcher-button theme-switcher-light bg-gray-200 border-gray-200 border-2 dark:bg-black dark:border-black p-2 focus:outline-none" title="Light"><i class="fas fa-sun pointer-events-none"></i> Light</button><button class="theme-switcher-button theme-switcher-dark bg-gray-200 border-gray-200 border-2 dark:bg-black dark:border-black p-2 focus:outline-none" title="Dark"><i class="fas fa-moon pointer-events-none"></i> Dark</button><button class="theme-switcher-button theme-switcher-auto bg-gray-200 border-gray-200 dark:bg-black border-2 dark:border-black p-2 focus:outline-none" title="Auto"><i class="fas fa-adjust pointer-events-none"></i> Auto</button>
        </div>
    </div>
    <form action="" class="my-20 p-10 max-w-xl mx-auto shadow-md sm:border-0 md:border md:border-gray-900 md:dark:border-gray-100 bg-gray-100 dark:bg-gray-800 text-gray-900 dark:text-gray-100">
        <div class="mb-10">
            <h1 class="font-bold text-4xl mb-3">Get in touch</h1>
            <p class="font-medium text-lg mb-5">Send us a quick message and we'll get back to you shortly.</p>
            <hr class="border-gray-900 dark:border-gray-100">
        </div>
        <div class="mb-5">
            <label for="message" class="text-lg flex justify-between items-end"><span>Message</span><span class="text-xs text-red-500">Required</span></label>
            <textarea name="message" id="message" cols="30" rows="10" class="shadow-md mt-1 block w-full sm:text-sm rounded-none border-gray-900 dark:border-gray-100 bg-white dark:bg-gray-900"></textarea>
        </div>
        <div class="mb-5">
            <label for="name" class="text-lg flex justify-between items-end"><span>Name</span><span class="text-xs text-red-500 ">Required</span></label>
            <div class="mt-1 flex shadow-md">
                <span class="inline-flex items-center px-3 rounded-none border border-r-0 border-gray-900 dark:border-gray-100"><i class="fas fa-user"></i></span>
                <input type="text" name="name" class="flex-1 block w-full sm:text-sm rounded-none border border-gray-900 dark:border-gray-100 bg-white dark:bg-gray-900">
            </div>
        </div>
        <div class="mb-5">
            <label for="email" class="text-lg flex justify-between items-end"><span>Email</span><span class="text-xs text-red-500">Required</span></label>
            <div class="mt-1 flex shadow-md">
                <span class="inline-flex items-center px-3 rounded-none border border-r-0 border-gray-900 dark:border-gray-100"><i class="fas fa-envelope"></i></span>
                <input type="email" name="email" class="flex-1 block w-full sm:text-sm rounded-none border border-gray-900 dark:border-gray-100 bg-white dark:bg-gray-900">
            </div>
        </div>
        <div>
            <button type="button" class="font-medium shadow-md rounded-none p-2 w-full focus:outline-none focus:ring-2 focus:ring-offset-2 border border-gray-900 dark:border-gray-100 bg-gray-800 dark:bg-gray-200 text-gray-200 dark:text-gray-800 hover:bg-gray-900 dark:hover:bg-gray-100"><i class="fas fa-check"></i> Send</button>
        </div>
    </form>
</body>
              
            
!

CSS

              
                /*! tailwindcss v2.0.3 | MIT License | https://tailwindcss.com */

/*! modern-normalize v1.0.0 | MIT License | https://github.com/sindresorhus/modern-normalize */

/*
Document
========
*/

/**
Use a better box model (opinionated).
*/

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

/**
Use a more readable tab size (opinionated).
*/

:root {
  -moz-tab-size: 4;
  -o-tab-size: 4;
     tab-size: 4;
}

/**
1. Correct the line height in all browsers.
2. Prevent adjustments of font size after orientation changes in iOS.
*/

html {
  line-height: 1.15; /* 1 */
  -webkit-text-size-adjust: 100%; /* 2 */
}

/*
Sections
========
*/

/**
Remove the margin in all browsers.
*/

body {
  margin: 0;
}

/**
Improve consistency of default fonts in all browsers. (https://github.com/sindresorhus/modern-normalize/issues/3)
*/

body {
  font-family:
		system-ui,
		-apple-system, /* Firefox supports this but not yet `system-ui` */
		'Segoe UI',
		Roboto,
		Helvetica,
		Arial,
		sans-serif,
		'Apple Color Emoji',
		'Segoe UI Emoji';
}

/*
Grouping content
================
*/

/**
1. Add the correct height in Firefox.
2. Correct the inheritance of border color in Firefox. (https://bugzilla.mozilla.org/show_bug.cgi?id=190655)
*/

hr {
  height: 0; /* 1 */
  color: inherit; /* 2 */
}

/*
Text-level semantics
====================
*/

/**
Add the correct text decoration in Chrome, Edge, and Safari.
*/

abbr[title] {
  -webkit-text-decoration: underline dotted;
          text-decoration: underline dotted;
}

/**
Add the correct font weight in Edge and Safari.
*/

b,
strong {
  font-weight: bolder;
}

/**
1. Improve consistency of default fonts in all browsers. (https://github.com/sindresorhus/modern-normalize/issues/3)
2. Correct the odd 'em' font sizing in all browsers.
*/

code,
kbd,
samp,
pre {
  font-family:
		ui-monospace,
		SFMono-Regular,
		Consolas,
		'Liberation Mono',
		Menlo,
		monospace; /* 1 */
  font-size: 1em; /* 2 */
}

/**
Add the correct font size in all browsers.
*/

small {
  font-size: 80%;
}

/**
Prevent 'sub' and 'sup' elements from affecting the line height in all browsers.
*/

sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

/*
Tabular data
============
*/

/**
1. Remove text indentation from table contents in Chrome and Safari. (https://bugs.chromium.org/p/chromium/issues/detail?id=999088, https://bugs.webkit.org/show_bug.cgi?id=201297)
2. Correct table border color inheritance in all Chrome and Safari. (https://bugs.chromium.org/p/chromium/issues/detail?id=935729, https://bugs.webkit.org/show_bug.cgi?id=195016)
*/

table {
  text-indent: 0; /* 1 */
  border-color: inherit; /* 2 */
}

/*
Forms
=====
*/

/**
1. Change the font styles in all browsers.
2. Remove the margin in Firefox and Safari.
*/

button,
input,
optgroup,
select,
textarea {
  font-family: inherit; /* 1 */
  font-size: 100%; /* 1 */
  line-height: 1.15; /* 1 */
  margin: 0; /* 2 */
}

/**
Remove the inheritance of text transform in Edge and Firefox.
1. Remove the inheritance of text transform in Firefox.
*/

button,
select { /* 1 */
  text-transform: none;
}

/**
Correct the inability to style clickable types in iOS and Safari.
*/

button,
[type='button'] {
  -webkit-appearance: button;
}

/**
Remove the inner border and padding in Firefox.
*/

/**
Restore the focus styles unset by the previous rule.
*/

/**
Remove the additional ':invalid' styles in Firefox.
See: https://github.com/mozilla/gecko-dev/blob/2f9eacd9d3d995c937b4251a5557d95d494c9be1/layout/style/res/forms.css#L728-L737
*/

/**
Remove the padding so developers are not caught out when they zero out 'fieldset' elements in all browsers.
*/

legend {
  padding: 0;
}

/**
Add the correct vertical alignment in Chrome and Firefox.
*/

progress {
  vertical-align: baseline;
}

/**
Correct the cursor style of increment and decrement buttons in Safari.
*/

/**
1. Correct the odd appearance in Chrome and Safari.
2. Correct the outline style in Safari.
*/

/**
Remove the inner padding in Chrome and Safari on macOS.
*/

/**
1. Correct the inability to style clickable types in iOS and Safari.
2. Change font properties to 'inherit' in Safari.
*/

/*
Interactive
===========
*/

/*
Add the correct display in Chrome and Safari.
*/

summary {
  display: list-item;
}

/**
 * Manually forked from SUIT CSS Base: https://github.com/suitcss/base
 * A thin layer on top of normalize.css that provides a starting point more
 * suitable for web applications.
 */

/**
 * Removes the default spacing and border for appropriate elements.
 */

blockquote,
dl,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
hr,
figure,
p,
pre {
  margin: 0;
}

button {
  background-color: transparent;
  background-image: none;
}

/**
 * Work around a Firefox/IE bug where the transparent `button` background
 * results in a loss of the default `button` focus styles.
 */

button:focus {
  outline: 1px dotted;
  outline: 5px auto -webkit-focus-ring-color;
}

fieldset {
  margin: 0;
  padding: 0;
}

ol,
ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

/**
 * Tailwind custom reset styles
 */

/**
 * 1. Use the user's configured `sans` font-family (with Tailwind's default
 *    sans-serif font stack as a fallback) as a sane default.
 * 2. Use Tailwind's default "normal" line-height so the user isn't forced
 *    to override it to ensure consistency even when using the default theme.
 */

html {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"; /* 1 */
  line-height: 1.5; /* 2 */
}

/**
 * Inherit font-family and line-height from `html` so users can set them as
 * a class directly on the `html` element.
 */

body {
  font-family: inherit;
  line-height: inherit;
}

/**
 * 1. Prevent padding and border from affecting element width.
 *
 *    We used to set this in the html element and inherit from
 *    the parent element for everything else. This caused issues
 *    in shadow-dom-enhanced elements like <details> where the content
 *    is wrapped by a div with box-sizing set to `content-box`.
 *
 *    https://github.com/mozdevs/cssremedy/issues/4
 *
 *
 * 2. Allow adding a border to an element by just adding a border-width.
 *
 *    By default, the way the browser specifies that an element should have no
 *    border is by setting it's border-style to `none` in the user-agent
 *    stylesheet.
 *
 *    In order to easily add borders to elements by just setting the `border-width`
 *    property, we change the default border-style for all elements to `solid`, and
 *    use border-width to hide them instead. This way our `border` utilities only
 *    need to set the `border-width` property instead of the entire `border`
 *    shorthand, making our border utilities much more straightforward to compose.
 *
 *    https://github.com/tailwindcss/tailwindcss/pull/116
 */

*,
::before,
::after {
  box-sizing: border-box; /* 1 */
  border-width: 0; /* 2 */
  border-style: solid; /* 2 */
  border-color: #e5e7eb; /* 2 */
}

/*
 * Ensure horizontal rules are visible by default
 */

hr {
  border-top-width: 1px;
}

/**
 * Undo the `border-style: none` reset that Normalize applies to images so that
 * our `border-{width}` utilities have the expected effect.
 *
 * The Normalize reset is unnecessary for us since we default the border-width
 * to 0 on all elements.
 *
 * https://github.com/tailwindcss/tailwindcss/issues/362
 */

img {
  border-style: solid;
}

textarea {
  resize: vertical;
}

input::-moz-placeholder, textarea::-moz-placeholder {
  opacity: 1;
  color: #9ca3af;
}

input:-ms-input-placeholder, textarea:-ms-input-placeholder {
  opacity: 1;
  color: #9ca3af;
}

input::placeholder,
textarea::placeholder {
  opacity: 1;
  color: #9ca3af;
}

button {
  cursor: pointer;
}

table {
  border-collapse: collapse;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: inherit;
  font-weight: inherit;
}

/**
 * Reset links to optimize for opt-in styling instead of
 * opt-out.
 */

a {
  color: inherit;
  text-decoration: inherit;
}

/**
 * Reset form element properties that are easy to forget to
 * style explicitly so you don't inadvertently introduce
 * styles that deviate from your design system. These styles
 * supplement a partial reset that is already applied by
 * normalize.css.
 */

button,
input,
optgroup,
select,
textarea {
  padding: 0;
  line-height: inherit;
  color: inherit;
}

/**
 * Use the configured 'mono' font family for elements that
 * are expected to be rendered with a monospace font, falling
 * back to the system monospace stack if there is no configured
 * 'mono' font family.
 */

pre,
code,
kbd,
samp {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/**
 * Make replaced elements `display: block` by default as that's
 * the behavior you want almost all of the time. Inspired by
 * CSS Remedy, with `svg` added as well.
 *
 * https://github.com/mozdevs/cssremedy/issues/14
 */

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  vertical-align: middle;
}

/**
 * Constrain images and videos to the parent width and preserve
 * their instrinsic aspect ratio.
 *
 * https://github.com/mozdevs/cssremedy/issues/14
 */

img,
video {
  max-width: 100%;
  height: auto;
}


      [type='text'],
      [type='email'],
      [type='time'],
      textarea,
      select
     {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  background-color: #fff;
  border-color: #6b7280;
  border-width: 1px;
  border-radius: 0px;
  padding-top: 0.5rem;
  padding-right: 0.75rem;
  padding-bottom: 0.5rem;
  padding-left: 0.75rem;
  font-size: 1rem;
  line-height: 1.5rem;
}

[type='text']:focus, [type='email']:focus, [type='time']:focus, textarea:focus, select:focus {
  outline: 2px solid transparent;
  outline-offset: 2px;
  --tw-ring-inset: var(--tw-empty,/*!*/ /*!*/);
  --tw-ring-offset-width: 0px;
  --tw-ring-offset-color: #fff;
  --tw-ring-color: #2563eb;
  --tw-ring-offset-shadow: var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);
  --tw-ring-shadow: var(--tw-ring-inset) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color);
  box-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000);
  border-color: #2563eb;
}

input::-moz-placeholder, textarea::-moz-placeholder {
  color: #6b7280;
  opacity: 1;
}

input:-ms-input-placeholder, textarea:-ms-input-placeholder {
  color: #6b7280;
  opacity: 1;
}

input::placeholder, textarea::placeholder {
  color: #6b7280;
  opacity: 1;
}

select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
  -webkit-print-color-adjust: exact;
          color-adjust: exact;
}

.bg-white {
  --tw-bg-opacity: 1;
  background-color: rgba(255, 255, 255, var(--tw-bg-opacity));
}

.bg-gray-100 {
  --tw-bg-opacity: 1;
  background-color: rgba(243, 244, 246, var(--tw-bg-opacity));
}

.bg-gray-200 {
  --tw-bg-opacity: 1;
  background-color: rgba(229, 231, 235, var(--tw-bg-opacity));
}

.bg-gray-800 {
  --tw-bg-opacity: 1;
  background-color: rgba(31, 41, 55, var(--tw-bg-opacity));
}

.hover\:bg-gray-900:hover {
  --tw-bg-opacity: 1;
  background-color: rgba(17, 24, 39, var(--tw-bg-opacity));
}

.dark .dark\:bg-black {
  --tw-bg-opacity: 1;
  background-color: rgba(0, 0, 0, var(--tw-bg-opacity));
}

.dark .dark\:bg-gray-200 {
  --tw-bg-opacity: 1;
  background-color: rgba(229, 231, 235, var(--tw-bg-opacity));
}

.dark .dark\:bg-gray-800 {
  --tw-bg-opacity: 1;
  background-color: rgba(31, 41, 55, var(--tw-bg-opacity));
}

.dark .dark\:bg-gray-900 {
  --tw-bg-opacity: 1;
  background-color: rgba(17, 24, 39, var(--tw-bg-opacity));
}

.dark .dark\:hover\:bg-gray-100:hover {
  --tw-bg-opacity: 1;
  background-color: rgba(243, 244, 246, var(--tw-bg-opacity));
}

.border-gray-200 {
  --tw-border-opacity: 1;
  border-color: rgba(229, 231, 235, var(--tw-border-opacity));
}

.border-gray-900 {
  --tw-border-opacity: 1;
  border-color: rgba(17, 24, 39, var(--tw-border-opacity));
}

.dark .dark\:border-black {
  --tw-border-opacity: 1;
  border-color: rgba(0, 0, 0, var(--tw-border-opacity));
}

.dark .dark\:border-gray-100 {
  --tw-border-opacity: 1;
  border-color: rgba(243, 244, 246, var(--tw-border-opacity));
}

.rounded-none {
  border-radius: 0px;
}

.border-2 {
  border-width: 2px;
}

.border {
  border-width: 1px;
}

.border-r-0 {
  border-right-width: 0px;
}

.block {
  display: block;
}

.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

.table {
  display: table;
}

.items-end {
  align-items: flex-end;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

.flex-1 {
  flex: 1 1 0%;
}

.font-medium {
  font-weight: 500;
}

.font-bold {
  font-weight: 700;
}

.text-xs {
  font-size: 0.75rem;
  line-height: 1rem;
}

.text-lg {
  font-size: 1.125rem;
  line-height: 1.75rem;
}

.text-4xl {
  font-size: 2.25rem;
  line-height: 2.5rem;
}

.my-20 {
  margin-top: 5rem;
  margin-bottom: 5rem;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.mt-1 {
  margin-top: 0.25rem;
}

.mb-3 {
  margin-bottom: 0.75rem;
}

.mb-5 {
  margin-bottom: 1.25rem;
}

.mb-10 {
  margin-bottom: 2.5rem;
}

.max-w-xl {
  max-width: 36rem;
}

.focus\:outline-none:focus {
  outline: 2px solid transparent;
  outline-offset: 2px;
}

.p-2 {
  padding: 0.5rem;
}

.p-10 {
  padding: 2.5rem;
}

.px-3 {
  padding-left: 0.75rem;
  padding-right: 0.75rem;
}

.py-5 {
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
}

.pointer-events-none {
  pointer-events: none;
}

* {
  --tw-shadow: 0 0 #0000;
}

.shadow-md {
  --tw-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  box-shadow: var(--tw-ring-offset-shadow, 0 0 #0000), var(--tw-ring-shadow, 0 0 #0000), var(--tw-shadow);
}

* {
  --tw-ring-inset: var(--tw-empty,/*!*/ /*!*/);
  --tw-ring-offset-width: 0px;
  --tw-ring-offset-color: #fff;
  --tw-ring-color: rgba(59, 130, 246, 0.5);
  --tw-ring-offset-shadow: 0 0 #0000;
  --tw-ring-shadow: 0 0 #0000;
}

.focus\:ring-2:focus {
  --tw-ring-offset-shadow: var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);
  --tw-ring-shadow: var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color);
  box-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000);
}

.focus\:ring-offset-2:focus {
  --tw-ring-offset-width: 2px;
}

.text-gray-200 {
  --tw-text-opacity: 1;
  color: rgba(229, 231, 235, var(--tw-text-opacity));
}

.text-gray-900 {
  --tw-text-opacity: 1;
  color: rgba(17, 24, 39, var(--tw-text-opacity));
}

.text-red-500 {
  --tw-text-opacity: 1;
  color: rgba(239, 68, 68, var(--tw-text-opacity));
}

.dark .dark\:text-white {
  --tw-text-opacity: 1;
  color: rgba(255, 255, 255, var(--tw-text-opacity));
}

.dark .dark\:text-gray-100 {
  --tw-text-opacity: 1;
  color: rgba(243, 244, 246, var(--tw-text-opacity));
}

.dark .dark\:text-gray-800 {
  --tw-text-opacity: 1;
  color: rgba(31, 41, 55, var(--tw-text-opacity));
}

.w-full {
  width: 100%;
}

@-webkit-keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@-webkit-keyframes ping {
  75%, 100% {
    transform: scale(2);
    opacity: 0;
  }
}

@keyframes ping {
  75%, 100% {
    transform: scale(2);
    opacity: 0;
  }
}

@-webkit-keyframes pulse {
  50% {
    opacity: .5;
  }
}

@keyframes pulse {
  50% {
    opacity: .5;
  }
}

@-webkit-keyframes bounce {
  0%, 100% {
    transform: translateY(-25%);
    -webkit-animation-timing-function: cubic-bezier(0.8,0,1,1);
            animation-timing-function: cubic-bezier(0.8,0,1,1);
  }

  50% {
    transform: none;
    -webkit-animation-timing-function: cubic-bezier(0,0,0.2,1);
            animation-timing-function: cubic-bezier(0,0,0.2,1);
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(-25%);
    -webkit-animation-timing-function: cubic-bezier(0.8,0,1,1);
            animation-timing-function: cubic-bezier(0.8,0,1,1);
  }

  50% {
    transform: none;
    -webkit-animation-timing-function: cubic-bezier(0,0,0.2,1);
            animation-timing-function: cubic-bezier(0,0,0.2,1);
  }
}

.is-active {
  border: 2px solid rgb(107, 114, 128)!important;
}

@media (min-width: 640px) {
  .sm\:border-0 {
    border-width: 0px;
  }

  .sm\:text-sm {
    font-size: 0.875rem;
    line-height: 1.25rem;
  }
}

@media (min-width: 768px) {
  .md\:border-gray-900 {
    --tw-border-opacity: 1;
    border-color: rgba(17, 24, 39, var(--tw-border-opacity));
  }

  .dark .md\:dark\:border-gray-100 {
    --tw-border-opacity: 1;
    border-color: rgba(243, 244, 246, var(--tw-border-opacity));
  }

  .md\:border {
    border-width: 1px;
  }
}

@media (min-width: 1024px) {
}

@media (min-width: 1280px) {
}

@media (min-width: 1536px) {
}
              
            
!

JS

              
                const themeSwitcher = document.querySelector('.theme-switcher');

themeSwitcher.addEventListener('click', (e) => {
    setTheme(e);
	getTheme();
});

window.addEventListener('load', () => {
    getTheme();
});

window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', e => {
    getTheme();
});

function setActive(selectedButton) {
    const themeSwitcherButtons = document.querySelectorAll('.theme-switcher-button');
    themeSwitcherButtons.forEach((button) => {
        if (button.classList.contains('is-active')) {
            button.classList.remove('is-active');
        }
    })
    let activeButton = document.querySelector(`.theme-switcher-${selectedButton}`);
    activeButton.classList.add('is-active');
}

function getTheme() {
    const localTheme = localStorage.theme;
    let selectedButton;

    if (localTheme === 'dark') {
        document.documentElement.classList.add('dark');
        selectedButton = 'dark';
    } else if (localTheme === 'light') {
        document.documentElement.classList.remove('dark');
        selectedButton = 'light';
    } else {
        if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
            document.documentElement.classList.add('dark');
        } else {
            document.documentElement.classList.remove('dark');
        }
        selectedButton = 'auto';
    }
    
    setActive(selectedButton);
}

function setTheme(e) {
    let elem = e.target;

    if (elem.classList.contains('theme-switcher-dark')) {
        localStorage.theme = 'dark';
    } else if (elem.classList.contains('theme-switcher-light')) {
        localStorage.theme = 'light';
    } else {
        localStorage.removeItem('theme');
    }
}
              
            
!
999px

Console