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HTML

              
                <body>
  <!-- No need to add anything to your HTML -->
  <div id="main">
    <section class="container-1">
      <h1>Notifs</h1>
      <h2>Clean, yet beautiful notifications in your website</h2>

      <button onclick="createNotification()">Show notification</button>
    </section>

    <input id="input-content" type="text" value="Your notification text" placeholder="Your notification text">

    <section class="container-2">
      <label for="select-theme">Theme</label>
      <div class="select-style">
        <select id="select-theme" name="select-theme">
          <option value="0">Light</option>
          <option value="1" selected>Dark</option>
        </select>
      </div>

      <label for="select-content-type">Content type</label>
      <div class="select-style">
        <select id="select-content-type" name="select-content-type">
          <option value="0" selected>Default</option>
          <option value="1">Success</option>
          <option value="2">Error</option>
          <option value="3">Warning</option>
          <option value="4">Info</option>
        </select>
      </div>

      <label for="select-position">Position</label>
      <div class="select-style">
        <select id="select-position" name="select-position">
          <option value="0" selected>Whole screen</option>
          <option value="1">Right side</option>
          <option value="2">Bottom side</option>
          <option value="3">Bottom right corner</option>
        </select>
      </div>

      <label for="select-regime">Regime</label>
      <div class="select-style">
        <select id="select-regime" name="select-regime">
          <option value="0" selected>Just one</option>
          <option value="1">Dominant</option>
          <option value="2">Side by side</option>
          <option value="3">Clear</option>
        </select>
      </div>

      <label for="select-lifespan">Lifespan</label>
      <div class="select-style">
        <select id="select-lifespan" name="select-lifespan">
          <option value="0">One second</option>
          <option value="1" selected>Two seconds</option>
          <option value="2">Three seconds</option>
          <option value="3">Four seconds</option>
          <option value="4">Five seconds</option>
          <option value="5">Till close</option>
        </select>
      </div>
    </section>
  </div>
</body>
              
            
!

CSS

              
                /* notifs styles */

:root {
  --notifs-background-color: rgba(255, 255, 255, 0.9);
  --notifs-content-color: #000000;
  --notifs-content-size: 1.5em;
  --notifs-content-opaque-color: rgba(177, 177, 177, 0.5);

  --notifs-content-type-success-color: #2eb74d;
  --notifs-content-type-error-color: #c43b48;
  --notifs-content-type-warning-color: #dba810;
  --notifs-content-type-info-color: #38a2b3;
}

.notifs-close-button {
  font-size: xxx-large;
  cursor: pointer;
}

.notifs-canvas {
  display: flex;
  right: 0;
  bottom: 0;
  background-color: var(--notifs-background-color);
  position: fixed;
  overflow-x: hidden;
  z-index: 9999;
}

.notifs-canvas-hidden {
  width: 0;
  height: 0;
  transition: height 0s linear 0.5s, width 0.5s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.notifs-canvas-whole-screen {
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
  transition: width 0.5s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.notifs-canvas-whole-screen .notifs-content {
  max-width: 100vw;
  max-height: 100vh;
}

.notifs-canvas-right-side {
  justify-content: center;
  align-items: center;
  width: 20em;
  height: 100vh;
  transition: width 0.5s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.notifs-canvas-right-side .notifs-content {
  max-width: 20em;
  max-height: 100vh;
}

.notifs-canvas-bottom-side {
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 10em;
    transition: width 0.5s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.notifs-canvas-bottom-side .notifs-content {
    max-width: 100vw;
    max-height: 10em;
}

.notifs-canvas-bottom-right-corner {
  justify-content: center;
  align-items: center;
  width: 20em;
  height: 10em;
  transition: width 0.5s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.notifs-canvas-bottom-right-corner .notifs-content {
  max-width: 20em;
  max-height: 10em;
}

.notifs-content {
  display: flex;
  flex-direction: column;
  align-content: space-between;
  margin: 5%;
  padding: unset;
  font-size: var(--notifs-content-size);
  color: var(--notifs-content-color);
}

.notifs-content-type-1 {
  color: var(--notifs-content-type-success-color);
}

.notifs-content-type-2 {
  color: var(--notifs-content-type-error-color);
}

.notifs-content-type-3 {
  color: var(--notifs-content-type-warning-color);
}

.notifs-content-type-4 {
  color: var(--notifs-content-type-info-color);
}

.notifs-content-hidden {
  display: none;
}

.notifs-content li {
  list-style: none;
  text-align: center;
}

.notifs-content li:not(:last-child) {
  padding-bottom: 3%;
}

.notifs-hidden {
  display: none;
}

.notifs-opaque {
  color: var(--notifs-content-opaque-color);
}
/* end of notifs styles*/

/*-----------------------------------------------------*/

/* showcase page styles */

body {
  margin: 0;
  padding: 0;
  font-family: Montserrat Light, Arial, Sans Serif;
  color: #343434;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(to bottom right, #fff, #bfbfbf);
  min-height: 100vh;
}

h1 {
  font-size: 3em;
  font-weight: normal;
  margin: 1em 0 0.5em 0;
}

h2 {
  font-size: 1.2em;
  font-weight: normal;
}

.container-1, .container-2 {
  margin-left: 2.5em;
  margin-right: 2.5em;
  display: flex;
  flex-direction: column;
  align-content: space-between;
}

.container-2 {
  align-items: center;
}

.container-2 *:not(label) {
  margin-top: 0.5em;
  margin-bottom: 0.5em;
}

.container-2:last-child {
  margin-bottom: 4em;
}

button, input, select {
  width: 100%;
  height: 1.5em;
  font-family: Montserrat Light, Arial, Sans Serif;
  font-size: 1.3em;
  color: #343434;
  border: none;
}

button {
  height: 3em;
  margin-top: 3em;
  background-color: #fff;
  cursor: pointer;
  border-radius: 50px;
  -moz-box-shadow: 0 5px 5px rgba(0, 0, 0, 0.1);
  -webkit-box-shadow: 0 5px 5px rgba(0, 0, 0, 0.1);
  box-shadow: 0 5px 5px rgba(0, 0, 0, 0.1);
  transition: all .2s linear;
}

input {
  width: 99%;
  background: none;
  border-bottom: #878787 solid 2px;
  text-align: center;
  font-size: 1.7em;
  margin-top: 3.5em;
  margin-bottom: 3em;
}

label {
  font-size: 1.3em; 
  margin-top: 1.5em;
  margin-bottom: 1em;
}

/*select*/

.select-style {
  padding: 0;
  margin: 0;
  width: 100%;
  border-radius: 10px;
  overflow: hidden;
  background-color: #fff;
  -moz-box-shadow: 0 5px 5px rgba(0, 0, 0, 0.1);
  -webkit-box-shadow: 0 5px 5px rgba(0, 0, 0, 0.1);
  box-shadow: 0 5px 5px rgba(0, 0, 0, 0.1);
}

.select-style select {
  height: 2em;
  text-indent: 0.5em;
  width: 100%;
  border: none;
  box-shadow: none;
  background-color: transparent;
  background-image: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.select-style select:focus {
  outline: none;
}

/*end of select*/

button:hover {
  transform: scale(1.02, 1.02);
}

button:active {
  transform: scale(1, 1);
}
              
            
!

JS

              
                /** Enums representing notification's options. */
/** Light and dark theme */
enum NTheme { Light, Dark, }
/** Notification content type - differs in content color */
enum NContentType { Default, Success, Error, Warning, Info, }
/** Position of notification (with BottomRightCorner consider setting Regime to JustOne or Clear) */
enum NPosition { WholeScreen, RightSide, BottomSide, BottomRightCorner, }
/** Regime - JustOne (shows only last notification), Dominant (shows all notifications, but the last one is more dominant), SideBySide (shows all notifications), Clear (shown only last and clears history) */
enum NRegime { JustOne, Dominant, SideBySide, Clear, }
/** Lifespan of notification, when TillClosed set, close button will appear */
enum NLifespan { OneSecond, TwoSeconds, ThreeSeconds, FourSeconds, FiveSeconds, TillClosed, }

/*-----------------------------------------------------*/

/**
 * Necessary to call to make notifs work
 */
function initNotifs(): void {
    let olNotifications = document.createElement('ol');
    olNotifications.classList.add('notifs-content', 'notifs-content-hidden');
    let divNotifications = document.createElement('div');
    divNotifications.classList.add('notifs-canvas', 'notifs-canvas-hidden');
    divNotifications.appendChild(olNotifications);
    //append necessary notifs element to body
    document.getElementsByTagName('body')[0].appendChild(divNotifications);
}
initNotifs(); //calling to init notifs

/*-----------------------------------------------------*/

/**
 * Call this function with desired parameters to build notification.
 * 
 * @param {string} text Content text of notification.
 * @param {NTheme} theme Theme of notification.
 * @param {NContentType} contentType Differentiates content text.
 * @param {NPosition} position Whole screen / Right side / Bottom right corner.
 * @param {NRegime} regime Option to show just the last one or the other notifications too.
 * @param {NLifespan} lifespan Lifespan of notification, could disappear after few seconds or stay there till user dismisses it.
 */
function buildNotification(
 text: string,
 theme: NTheme = NTheme.Dark,
 contentType: NContentType = NContentType.Default,
 position: NPosition = NPosition.BottomRightCorner,
 regime: NRegime = NRegime.JustOne,
 lifespan: NLifespan = NLifespan.OneSecond): void {

  //remove close button
  removeCloseButton();

  //theme
  document.documentElement.style.setProperty('--notifs-background-color', theme === NTheme.Dark ? 'rgba(0, 0, 0, 0.8)' : 'rgba(255, 255, 255, 0.9)');
  document.documentElement.style.setProperty('--notifs-content-color', theme === NTheme.Dark ? '#ffffff' : '#000000');

  //position
  getCanvas().classList.remove('notifs-canvas-hidden');
  getContent().classList.remove('notifs-content-hidden');

  switch (position) {
    case NPosition.WholeScreen:
      getCanvas().classList.add('notifs-canvas-whole-screen');
      break;
    case NPosition.RightSide:
      getCanvas().classList.add('notifs-canvas-right-side');
      break;
    case NPosition.BottomSide:
      getCanvas().classList.add('notifs-canvas-bottom-side');
      break;
    default:
      getCanvas().classList.add('notifs-canvas-bottom-right-corner');
      break;
  }

  //regime
  //recommended regime for bottom right corner notification is JustOne or Clear
  switch (regime) {
    case NRegime.Clear:
      clearActives();
      break;
    case NRegime.JustOne:
      hideAll();
      break;
    case NRegime.Dominant:
      makeAllDefault();
      makeAllOpaque();
      break;
    default:
      makeAllDefault();
      break;
  }

  //content and content type
  //it takes roughly about 100 characters to correctly fit bottom right corner notification
  addNotification(text, contentType);

  //lifespan
  if (lifespan !== NLifespan.TillClosed) {
    let timeout = 0;
    switch (lifespan) {
      case NLifespan.TwoSeconds:
        timeout = 2000;
        break;
      case NLifespan.ThreeSeconds:
        timeout = 3000;
        break;
      case NLifespan.FourSeconds:
        timeout = 4000;
        break;
      case NLifespan.FiveSeconds:
        timeout = 5000;
        break;
      default:
        timeout = 1000;
        break;
    }
    setTimeout(() => {
      hide();
    }, timeout);
  } else {
    addCloseButton();
  }
}

/*-----------------------------------------------------*/

function getCanvas(): HTMLElement {
  return document.getElementsByClassName('notifs-canvas')[0] as HTMLElement;
}

function getCloseButton(): HTMLElement {
  return document.getElementsByClassName('notifs-cross')[0] as HTMLElement;
}

function getContent(): HTMLOListElement {
  return document.getElementsByClassName('notifs-content')[0] as HTMLOListElement;
}

function getActiveCount(): number {
  return document.getElementById('notifs-content').childElementCount;
}

/**
 * Adds notification to html document. Called from buildNotification.
 */
function addNotification(text: string, contentType: NContentType = NContentType.Default): void {
  let newNotification = document.createElement('li');
  newNotification.innerHTML = text;
  if (contentType !== NContentType.Default) {
    newNotification.classList.add(`notifs-content-type-${contentType}`);
  }
  getContent().appendChild(newNotification);
}

function addCloseButton(): void {
  let closeButton = document.createElement('li');
  closeButton.innerHTML = '&times;';
  closeButton.id = 'notifs-close-button';
  closeButton.classList.add('notifs-close-button');
  closeButton.addEventListener('click', hide);
  getContent().appendChild(closeButton);
}

function removeCloseButton(): void {
  if (getContent().lastChild !== null && ((getContent().lastChild as HTMLElement).id === 'notifs-close-button')) {
    getContent().removeChild(getContent().lastChild);
  }
}

function hide(): void {
  getCanvas().classList.remove('notifs-canvas-whole-screen', 'notifs-canvas-right-side', 'notifs-canvas-bottom-side', 'notifs-canvas-bottom-right-corner');
  getCanvas().classList.add('notifs-canvas-hidden');
  getCanvas().removeEventListener('click', hide);

  getContent().classList.add('notifs-content-hidden');
}

function clearActives(): void {
  while (getContent().hasChildNodes()) {
    getContent().removeChild(getContent().lastChild);
  }
}

function makeAllDefault(): void {
  for (let i = 0; i < getContent().children.length; i++) {
    getContent().children[i].classList.remove('notifs-hidden', 'notifs-opaque');
  }
}

function hideAll(): void {
  for (let i = 0; i < getContent().children.length; i++) {
    getContent().children[i].classList.add('notifs-hidden');
  }
}

function makeAllOpaque(): void {
  for (let i = 0; i < getContent().children.length; i++) {
    getContent().children[i].classList.add('notifs-opaque');
  }
}

/*-----------------------------------------------------*/

/**
 * This function is called from showcase site. For your project, call buildNotification above to create notifs.
 */
function createNotification() {
  const content = (document.getElementById('input-content') as HTMLInputElement).value;
  const theme = Number((document.getElementById('select-theme') as HTMLSelectElement).value);
  const contentType = Number((document.getElementById('select-content-type') as HTMLSelectElement).value);
  const position = Number((document.getElementById('select-position') as HTMLSelectElement).value);
  const regime = Number((document.getElementById('select-regime') as HTMLSelectElement).value);
  const lifespan = Number((document.getElementById('select-lifespan') as HTMLSelectElement).value);

  buildNotification(content, theme, contentType, position, regime, lifespan);
}
              
            
!
999px

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