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HTML 

              
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    </symbol>
    <symbol id="icon-rocket" viewBox="0 0 494.929 494.929">
      <g>
        <g>
          <g>
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              l43.815-24.461l57.694,57.692L130.76,440.896z M190.852,408.504L86.427,304.083c19.758-64.946,53.183-121.287,99.417-167.517
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            <path d="M88.843,455.413c-22.158,16.192-47.842,24.079-71.5,22.171c-1.917-23.633,5.992-49.333,22.183-71.492
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            <path d="M333.427,161.508c-16.125-16.117-37.55-24.996-60.342-24.996c-22.8,0-44.225,8.879-60.342,24.996
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          </g>
        </g>
      </g>
    </symbol>
    <symbol id="icon-seo" viewBox="0 0 60 60">
      <path d="m25 4a21 21 0 1 0 21 21 21.024 21.024 0 0 0 -21-21zm0 40a19 19 0 1 1 19-19 19.021 19.021 0 0 1 -19 19z"/><path d="m58.535 51.465-6.671-6.672a4.951 4.951 0 0 0 -3.164-1.429l-3.567-3.564a25.033 25.033 0 1 0 -5.333 5.333l3.564 3.567a4.946 4.946 0 0 0 1.429 3.165l6.671 6.672a5 5 0 1 0 7.071-7.07zm-56.535-26.465a23 23 0 1 1 23 23 23.025 23.025 0 0 1 -23-23zm41.873 16.367 2.409 2.41a4.858 4.858 0 0 0 -2.5 2.5l-2.41-2.409a25.12 25.12 0 0 0 2.501-2.501zm13.247 15.754a3.067 3.067 0 0 1 -4.241 0l-6.672-6.672a3 3 0 0 1 4.242-4.242l6.672 6.672a3.031 3.031 0 0 1 -.001 4.242z"/><path d="m18.8 18.4a1 1 0 0 0 -1.4-.2l-8 6a1 1 0 0 0 0 1.6l8 6a1 1 0 1 0 1.2-1.6l-6.933-5.2 6.933-5.2a1 1 0 0 0 .2-1.4z"/><path d="m40.6 24.2-8-6a1 1 0 0 0 -1.2 1.6l6.933 5.2-6.933 5.2a1 1 0 1 0 1.2 1.6l8-6a1 1 0 0 0 0-1.6z"/><path d="m27.242 16.03a1 1 0 0 0 -1.212.728l-4 16a1 1 0 0 0 .728 1.212 1.017 1.017 0 0 0 .242.03 1 1 0 0 0 .969-.758l4-16a1 1 0 0 0 -.727-1.212z"/>
    </symbol>
    <symbol id="icon-target" viewBox="0 0 4335 4335">
      <path d="m1789 3012c-413 0-623-502-330-795 167-167 432-183 616-39l230-230c-312-270-781-254-1075 40-497 496-141 1348 559 1348 676 0 1038-798 598-1306l-230 230c237 303 21 752-368 752zm0 1321c-988 0-1787-799-1787-1787 0-987 799-1787 1787-1787 458 0 889 172 1222 484l180-181-96-484c-4-19 2-38 15-52l508-507c33-34 91-14 97 33l60 427 106-107c54-53 135 28 81 82l-106 106 427 59c47 7 67 65 33 98l-507 508c-14 13-33 19-52 15l-485-96-180 180c659 702 643 1802-40 2486-337 337-786 523-1263 523zm0-3458c-924 0-1672 748-1672 1671 0 924 748 1672 1672 1672 923 0 1671-748 1671-1672 0-427-159-830-449-1140l-230 230c485 527 471 1351-40 1862-526 527-1378 527-1905 0-525-525-525-1379 0-1904 512-511 1333-527 1863-40l230-230c-310-290-713-449-1140-449zm1425-289 75 378 383-383-55-399zm-1425 2018c-51 0-77-62-41-99l245-244c-139-100-331-85-452 37-221 221-63 599 248 599 286 0 450-325 285-555l-245 245c-11 11-26 17-40 17zm598-737 231-231c-485-443-1234-427-1700 40-480 480-480 1261 0 1741 481 481 1260 481 1741 0 467-467 480-1217 40-1700l-231 231c513 581 99 1503-679 1503-242 0-469-94-640-265-353-353-353-927 0-1280 338-339 881-354 1238-39zm1367-1205-383 384 378 75 404-403z"/></g>
    </symbol>
  </defs>
</svg>
<!--END SVG GRADIENT PART-->
<header class="header">
  <h1 class="header__title">Timeline Slider Concept</h1>
  <div class="header__btns">
    <a
       href="https://github.com/nat-davydova/timeline-slider-concept"
       class="header__btn"
       target="_blank"
       title="Check On Github"
       >Check On Github</a>
  </div>
</header>
<div class="content">
  <div class="container">
    <h2 class="content__title">Click Timeline Slider Points ⬇️</h2>
    <div class="timeline">
      <div class="timeline__stepper">
        <div class="timeline__step is-active">
          <svg class="timeline__icon timeline__icon--default">
            <use href="#icon-brain"/>
          </svg>
          <svg class="timeline__icon timeline__icon--active">
            <use href="#icon-brain"/>
          </svg>
          <p class="timeline__step-title">
            Brainstorm
          </p>
        </div>
        <div class="timeline__step">
          <svg class="timeline__icon timeline__icon--default">
            <use href="#icon-bulb"/>
          </svg>
          <svg class="timeline__icon timeline__icon--active">
            <use href="#icon-bulb"/>
          </svg>
          <p class="timeline__step-title">
            Discuss<br/>Ideas
          </p>
        </div>
        <div class="timeline__step">
          <svg class="timeline__icon timeline__icon--default">
            <use href="#icon-rocket"/>
          </svg>
          <svg class="timeline__icon timeline__icon--active">>
            <use href="#icon-rocket"/>
          </svg>
          <p class="timeline__step-title">
            Make<br/>Project
          </p>
        </div>
        <div class="timeline__step">
          <svg class="timeline__icon timeline__icon--default">
            <use href="#icon-target"/>
          </svg>
          <svg class="timeline__icon timeline__icon--active">
            <use href="#icon-target"/>
          </svg>
          <p class="timeline__step-title">
            Select<br/>Strategy
          </p>
        </div>
        <div class="timeline__step">
          <svg class="timeline__icon timeline__icon--default">
            <use href="#icon-seo"/>
          </svg>
          <svg class="timeline__icon timeline__icon--active">
            <use href="#icon-seo"/>
          </svg>
          <p class="timeline__step-title">
            SEO<br/>Target
          </p>
        </div>
        <div class="timeline__step">
          <svg class="timeline__icon timeline__icon--default">
            <use href="#icon-customers"/>
          </svg>
          <svg class="timeline__icon timeline__icon--active">
            <use href="#icon-customers"/>
          </svg>
          <p class="timeline__step-title">
            Happy<br />Customers
          </p>
        </div>
      </div>

      <div class="timeline__slides">
        <div class="timeline__slide">
          <h3 class="timeline__slide-title">Brainstorm</h3>
          <div class="timeline__slide-content">
            <p>Brainstorming is a great way to generate new ideas or to solve problems. When you
              engage in brainstorming, you allow yourself to think freely without any
              restrictions or limitations.</p>
          </div>
        </div>

        <div class="timeline__slide">
          <h3 class="timeline__slide-title">Discuss Ideas</h3>
          <div class="timeline__slide-content">
            <p>In order to fully explore and develop ideas, it is essential to engage in thoughtful
              and meaningful discussion. This can involve exchanging viewpoints and perspectives
              with others, asking probing questions, and considering alternative approaches.</p>
          </div>
        </div>

        <div class="timeline__slide">
          <h3 class="timeline__slide-title">Make Project</h3>
          <div class="timeline__slide-content">
            <p>Creating a project involves many steps, such as identifying the problem or
              opportunity, defining the scope and objectives, determining the resources
              needed, planning the timeline and milestones, executing the plan, and monitoring
              and controlling the project progress. </p>
          </div>
        </div>

        <div class="timeline__slide">
          <h3 class="timeline__slide-title">Select Strategy</h3>
          <div class="timeline__slide-content">
            <p>When it comes to selecting a strategy, there are several factors to consider. For
              example, you should think about the company's goals, available resources, and
              industry trends. Additionally, you may want to do some market research to identify
              potential opportunities and areas of growth.</p>
          </div>
        </div>

        <div class="timeline__slide">
          <h3 class="timeline__slide-title">SEO Target</h3>
          <div class="timeline__slide-content">
            <p>SEO target is an essential component of digital marketing. It is a process of
              optimizing the website and its content to improve its ranking in search engine
              results pages. </p>
          </div>
        </div>

        <div class="timeline__slide">
          <h3 class="timeline__slide-title">Happy Customers</h3>
          <div class="timeline__slide-content">
            <p>Happy customers are the backbone of any successful business. They are the ones who
              keep coming back, bringing their friends and family along, and spreading the word
              about your brand.</p>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                :root {
    --color-accent-light: #00DBDE;
    --color-accent-dark: #FC00FF;
    --color-secondary: #ccc;

    --text-color-default: #2c2c2c;
    --text-color-light: #fff;

    --font-size-default: 15px;
    --font-size-lg: 25px;

    --font-weight-regular: 400;
    --font-weight-semibold: 600;
    --font-weight-default: var(--font-weight-regular);

    --border-color-default: var(--color-secondary);
    --border-color-accent: var(--color-accent-dark);

    --bg-color-default: #fff;
    --bg-color-dark: #2c2c2c;
    --bg-color-accent--lignt: var(--color-accent-light);
    --bg-color-accent--dark: var(--color-accent-dark);

    --transition-duration: .2s;
    --transition-timing-function: linear;
    --transition-delay: 0s;

    --negative-multiplier: -1;

    --gradient-default: linear-gradient(122deg, var(--color-accent-light) 0%, var(--color-accent-dark) 100%);

}

body {
    font-family: 'Montserrat', sans-serif;
    font-size: var(--font-size-default);
    color: var(--text-color-default);
}

/* EXAMPLE STYLES: YOU DON'T NEED THEM!!! */
.header {
    max-width: 500px;
    margin: auto;
    text-align: center;
}

.header__btns {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 30px;
}

body a {
    color: inherit;
    text-decoration: none;
}

.header__btn {
    transition:
            all
            var(--transition-duration)
            var(--transition-timing-function)
            var(--transition-delay);
    padding: 10px 20px;
    margin-right: 10px;
    background-color: var(--bg-color-default);
    border: 1px solid var(--border-color-default);
    border-radius: 3px;
    cursor: pointer;
    outline: none;
}

.header__btn:hover,
.header__btn.js-active {
    color: var(--text-color-light);
    background-color: var(--bg-color-dark);
}

.header__title {
    margin-bottom: 10px;
    font-weight: var(--font-weight-semibold);
}

.content {
    margin: 50px auto;
}

.content__title {
    margin-bottom: 80px;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-default);
    text-align: center;
}

/* TIMELINE STYLES: YOU NEED THEM!!! */
.timeline {
    --wrapper-width: 900px;

    width: 95%;
    max-width: var(--wrapper-width);
    margin: auto;
}

.timeline__stepper {
    --step-border-width: 3px;
    --offset-to-slider-content: 30px;

    position: relative;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: var(--offset-to-slider-content);
}

@media(min-width: 530px) {
    .timeline__stepper {
        display: flex;
        justify-content: space-around;
        gap: 0;
    }
}

@media(min-width: 700px) {
    .timeline__stepper {
        --offset-to-slider-content: 50px;
    }
}

.timeline__step {
    position: relative;
    width: 100%;
    cursor: pointer;
}

@media(min-width: 530px) {
    .timeline__step {
        width: 100%;;
    }
}

.timeline__icon {
    --timeline-icon-dimensions: 45px;

    position: relative;
    display: block;
    width: var(--timeline-icon-dimensions);
    max-height: var(--timeline-icon-dimensions);
    height: auto;
    margin: 0 auto;
    transition: opacity var(--transition-duration) var(--transition-timing-function) var(--transition-delay);
}

@media(min-width: 700px) {
    .timeline__icon {
        --timeline-icon-dimensions: 60px;

        margin-bottom: 30px;
    }
}

.timeline__icon--active {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    fill: url(#icon-gradient);
    opacity: 0;
}

.timeline__step-title {
    --timeline-dot-dimensions: 11px;
    --extra-offset-fox-pixelperfect: -1px;

    position: relative;
    display: none;
    padding-top: 30px;
    margin-bottom: 0;
    text-align: center;
    line-height: 1.7;
    border-top: var(--step-border-width) solid var(--border-color-default);
}

@media(min-width: 700px) {
    .timeline__step-title {
        display: block;
    }
}

.timeline__step-title:before,
.timeline__step-title:after {
    position: absolute;
    top: var(--dot-top-position);
    left: 50%;
    display: block;
    width: var(--timeline-dot-dimensions);
    height: var(--timeline-dot-dimensions);
    content: '';
    border-radius: 50%;
}

.timeline__step-title:before {
    --dot-top-position: calc(
            var(--timeline-dot-dimensions)/2 * var(--negative-multiplier) + var(--extra-offset-fox-pixelperfect)
    );

    transform: translate(-50%);
    border: 2px solid var(--border-color-default);
    border-radius: 50%;
    background-color: #fff;
    z-index: 5;
}

.timeline__step-title:after {
    --timeline-dot-dimensions: 25px;
    --dot-top-position: calc(
            var(--timeline-dot-dimensions)/2 * var(--negative-multiplier) + var(--extra-offset-fox-pixelperfect)
    );

    transform: translate(-50%) scale(0);
    border-radius: 50%;
    background-color: #fff;
}

/* this elements generates in JS */
.timeline__step-active-marker {
    --slide-pos-y: none; /* calcs on the fly in js */
    --slide-pos-x: none; /* calcs on the fly in js */
    --slide-width: auto; /* calcs on the fly in js */

    --transition-timing-function: cubic-bezier(0, 0, 0, 1.2);

    position: absolute;
    top: var(--slide-pos-y);
    left: 0;
    display: none;
    width: var(--slide-width);
    height: var(--step-border-width);
    transform: translateX(var(--slide-pos-x));
    transition: transform var(--transition-duration) var(--transition-timing-function) var(--transition-delay);
    background-image: var(--gradient-default);
}

@media(min-width: 700px) {
    .timeline__step-active-marker {
        display: block;
    }
}

.timeline__step.is-active {
    cursor: default;
}

.timeline__step.is-active .timeline__step-title {
    font-weight: var(--font-weight-semibold);
}

.timeline__step.is-active .timeline__step-title:before {
    transition: background-color var(--transition-duration) var(--transition-timing-function) var(--transition-delay);
    background-color: var(--color-accent-dark);
    border-color: var(--border-color-accent);
}

.timeline__step.is-active .timeline__step-title:after {
    transform: translate(-50%) scale(1);
    transition: transform var(--transition-duration) var(--transition-timing-function) var(--transition-delay);
    background-image: var(--gradient-default);
    opacity: .35;
}

.timeline__step.is-active .timeline__icon--default,
.timeline__step:not(.is-active):hover .timeline__icon--default {
    opacity: 0;
}

.timeline__step.is-active .timeline__icon--active,
.timeline__step:not(.is-active):hover .timeline__icon--active {
    opacity: 1;
}

.timeline__slides {
    --slides-container-height: 0px; /* calcs on the fly in js */

    --content-offset-x: 20px;
    --content-offset-y: 30px;

    --decoration-blur-spread: 20px;
    --decoration-opacity: .7;
    --decoration-pos-x: 0;
    --decoration-pos-y: 20px;
    --decoration-scale: 1;

    position: relative;
    width: 600px;
    max-width: 100%;
    margin: auto;
    height: var(--slides-container-height);
    border-radius: 5px;
    background-color: var(--bg-color-default);
}

@media(min-width: 700px) {
    .timeline__slides {
        --content-offset-x: 30px;
        --content-offset-y: 40px;
    }
}

.timeline__slides:before {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    content: "";
    opacity: var(--decoration-opacity);
    background-image: var(--gradient-default);
    filter: blur(var(--decoration-blur-spread));
    transform: translate3d(var(--decoration-pos-x), var( --decoration-pos-y), 0) scale(var(--decoration-scale));
    z-index: -1;
}

.timeline__slide {
    position: absolute;
    top: 0;
    left: 0;
    padding: var(--content-offset-y) var(--content-offset-x);
    opacity: 0;
    visibility: hidden;
}

.timeline__slide.is-active {
    transition: opacity var(--transition-duration) var(--transition-timing-function) var(--transition-delay);
    opacity: 1;
    visibility: visible;
}

.timeline__slide-title {
    margin-top: 0;
}

.timeline__slide-content {
    line-height: 1.7;
}

.timeline__slide-content p:first-child {
    margin-top: 0;
}

.timeline__slide-content p:last-child {
    margin-bottom: 0;
}
!

JS 

              
                const DOM = {
  timeline: "timeline",
  timelineStepper: "timeline__stepper",
  timelineStep: "timeline__step",
  timelineStepTitle: "timeline__step-title",
  timelineStepActive: "is-active",
  timelineStepActiveMarker: "timeline__step-active-marker",
  timelineSlidesContainer: "timeline__slides",
  timelineSlide: "timeline__slide",
  timelineSlideActive: "is-active",
};

const STEP_ACTIVE_MARKEP_CUSTOM_PROPS = {
  width: "--slide-width",
  posX: "--slide-pos-x",
  posY: "--slide-pos-y",
};

const SLIDES_CONTAINER_CUSTOM_PROPS = {
  height: "--slides-container-height",
};

const timeline = document.querySelector(`.${DOM.timeline}`);
const timelineStepper = timeline?.querySelector(`.${DOM.timelineStepper}`);
const timelineStepTitle = timeline?.querySelector(`.${DOM.timelineStepTitle}`);
const timelineSlidesContainer = timeline?.querySelector(
  `.${DOM.timelineSlidesContainer}`
) as HTMLElement;
const timelineSlides =
  timeline && Array.from(timeline.querySelectorAll(`.${DOM.timelineSlide}`));

interface IGetStepActiveMarkerPositionProps {
  posX: number;
  posY: number;
  width: number;
}

interface ISetStepActiveMarkerPositionProps
  extends IGetStepActiveMarkerPositionProps {
  stepActiveMarker: HTMLElement;
}

interface ICurrentStepProps {
  currentStep: Element | undefined;
  currentStepIndex: number | undefined;
}

window.addEventListener("load", () => {
  createStepActiveMarker();
  activateCurrentSlide();
});

window.addEventListener("resize", () => {
  recalcStepActiveMarkerProps();
});

timeline?.addEventListener("click", (event) => {
  const { target } = event;

  if (
    !target ||
    !(target instanceof Element) ||
    !target.closest(`.${DOM.timelineStep}`)
  ) {
    return;
  }

  const currentStep = target.closest(`.${DOM.timelineStep}`);

  if (!currentStep) {
    return;
  }

  deactivateSteps();
  activateCurrentStep(currentStep);

  recalcStepActiveMarkerProps();

  deactivateSlides();
  activateCurrentSlide();
});

function deactivateSteps(): void {
  const steps = document.querySelectorAll(`.${DOM.timelineStep}`);
  steps?.forEach((elem) => elem.classList.remove(`${DOM.timelineStepActive}`));
}

function activateCurrentStep(currentStep: Element): void {
  currentStep?.classList.add(`${DOM.timelineStepActive}`);
}

function deactivateSlides() {
  timelineSlides?.forEach((elem) =>
    elem.classList.remove(`${DOM.timelineSlideActive}`)
  );
}

function activateCurrentSlide() {
  const currentSlide = getCurrentSlide();

  if (!currentSlide) {
    return;
  }

  const currentSlideHeight = getCurrentSlideHeight(currentSlide);
  setSlideContainerHeight(currentSlideHeight);
  currentSlide.classList.add(`${DOM.timelineSlideActive}`);
}

function createStepActiveMarker() {
  const stepActiveMarker = document.createElement("div");
  stepActiveMarker.classList.add(`${DOM.timelineStepActiveMarker}`);
  timelineStepper?.appendChild(stepActiveMarker);

  const positionProps = getStepActiveMarkerProps();

  if (!positionProps) {
    return;
  }

  setStepActiveMarkerProps({
    stepActiveMarker,
    ...positionProps,
  });
}

function recalcStepActiveMarkerProps(): void {
  const stepActiveMarker = timeline?.querySelector(
    `.${DOM.timelineStepActiveMarker}`
  ) as HTMLElement;

  const stepActiveMarkerProps = getStepActiveMarkerProps();
  if (!stepActiveMarkerProps) {
    return;
  }

  setStepActiveMarkerProps({ stepActiveMarker, ...stepActiveMarkerProps });
}

function setStepActiveMarkerProps({
  stepActiveMarker,
  posX,
  posY,
  width,
}: ISetStepActiveMarkerPositionProps): void {
  stepActiveMarker.style.setProperty(
    `${STEP_ACTIVE_MARKEP_CUSTOM_PROPS.width}`,
    `${width}px`
  );

  stepActiveMarker.style.setProperty(
    `${STEP_ACTIVE_MARKEP_CUSTOM_PROPS.posX}`,
    `${posX}px`
  );

  if (typeof posY === "number") {
    stepActiveMarker.style.setProperty(
      `${STEP_ACTIVE_MARKEP_CUSTOM_PROPS.posY}`,
      `${posY}px`
    );
  }
}

function getStepActiveMarkerProps(): IGetStepActiveMarkerPositionProps | null {
  const { currentStep } = getCurrentStep();

  if (!currentStep) {
    return null;
  }

  const width = getElementWidth(currentStep);
  const posX = getStepActiveMarkerPosX(currentStep);
  const posY = getStepActiveMarkerPosY();

  if (typeof posX !== "number" || typeof posY !== "number") {
    return null;
  }

  return { posX, posY, width };
}

function getCurrentStep(): ICurrentStepProps {
  const timelineSteps = Array.from(
    document.querySelectorAll(`.${DOM.timelineStep}`)
  );

  const currentStep = timelineSteps.find((element) =>
    element.classList.contains(`${DOM.timelineStepActive}`)
  );

  const currentStepIndex =
    currentStep &&
    timelineSteps.findIndex((element) =>
      element.classList.contains(`${DOM.timelineStepActive}`)
    );

  return { currentStep, currentStepIndex };
}

function getCurrentSlide(): Element | null {
  const { currentStepIndex } = getCurrentStep();

  if (typeof currentStepIndex !== "number" || !timelineSlides) {
    return null;
  }

  return timelineSlides[currentStepIndex];
}

function setSlideContainerHeight(height: number): void {
  timelineSlidesContainer?.style.setProperty(
    `${SLIDES_CONTAINER_CUSTOM_PROPS.height}`,
    `${height}px`
  );
}

function getCurrentSlideHeight(currentSlide: Element): number {
  return currentSlide.clientHeight;
}

function getStepActiveMarkerPosY(): number | null {
  const timelineTitlePosY = timelineStepTitle?.getBoundingClientRect().top;
  const timelineStepperPosY = timelineStepper?.getBoundingClientRect().top;

  if (!timelineTitlePosY || !timelineStepperPosY) {
    return null;
  }

  return timelineTitlePosY - timelineStepperPosY;
}

function getStepActiveMarkerPosX(currentStep: Element): number | null {
  const timelineStepperPosX = timelineStepper?.getBoundingClientRect().left;
  const currentStepPosX = currentStep.getBoundingClientRect().left;

  if (!timelineStepperPosX) {
    return null;
  }

  return currentStepPosX - timelineStepperPosX;
}

function getElementWidth(elem: Element): number {
  return elem.clientWidth;
}
!
999px

Console