Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <div id="slider" class="beer-slider" data-start="75">
  <div class="ctnr ctnr-winter">
    <svg class="winter" width="100%" height="100%" viewBox="0 0 600 361" preserveAspectRatio="xMidYMid slice" data-beer-src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/74321/original-baltic.jpg" aria-labelledby="title1" aria-role="img">
      <title id="title1">Baltic seashore -sepicol</title>
      <image xlink:href="https://s3-us-west-2.amazonaws.com/s.cdpn.io/74321/winter.jpg" x="0" y="0" width="100%" height="100%"></image>

    </svg>
    <section class="b b2">
      <h2>Baltic sea during Winter time</h2>
      <p>At -10.6 °C | 12.9 °F on average, January is the coldest month of the year. It is also the driest month. There is 12 mm | 0.5 inch of precipitation in January.</p>
    </section>

  </div>
  <div class="beer-reveal">
    <div class="ctnr ctnr-summer">
      <svg width="100%" height="100%" viewBox="0 0 600 361" preserveAspectRatio="xMidYMid slice" data-beer-src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/74321/warmsphere-baltic.jpg" aria-labelledby="title2" aria-role="img">
        <title id="title2">Baltic seashore - warmshphere preset applied</title>
        <image xlink:href="https://s3-us-west-2.amazonaws.com/s.cdpn.io/74321/warmsphere-baltic.jpg" x="0" y="0" width="100%" height="100%"></image>
      </svg>
      <section class="b b1">
        <h2>Baltic sea during Summer time</h2>
        <p>With an average of 22.8 °C | 73.0 °F, July is the warmest month. In June, the precipitation reaches its peak, with an average of 98 mm | 3.9 inch.</p>

      </section>
    </div>

  </div>

</div>

<main>
  <h1>Welcome to the Baltic seaside</h1>
  <p>The Baltic Sea is a mediterranean sea of the Atlantic Ocean, enclosed by Denmark, Estonia, Finland, Latvia, Lithuania, Sweden, northeast Germany, Poland, Russia and the North and Central European Plain. The sea stretches from 53°N to 66°N latitude and from 10°E to 30°E longitude.</p>
</main>
<svg>
  <defs>
    <clipPath id="svgPath" clipPathUnits="objectBoundingBox" transform="scale(0.00083 0.0075)">
      <path d="M1397,490H204c263,0,160-32,371-33,191.52-.91,150.49-135.14,225-92C990,475,1144,490,1397,490Z" transform="translate(-178 -350.46)" />
    </clipPath>
  </defs>
</svg>
              
            
!

CSS

              
                .beer-slider {
  *,
  &:before,
  &:after,
  *:before,
  *:after {
    box-sizing: border-box;
  }
  display: inline-block;
  position: relative;
  overflow: hidden;

  svg {
    vertical-align: bottom;
  }
}
.beer-reveal {
  --width: 50%;
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  clip-path: polygon(0 0, var(--width) 0, var(--width) 100%, 0 100%);
  overflow: hidden;
  z-index: 1;
  opacity: 0;
  transition: opacity 0.35s;
}

.beer-range {
  position: absolute;
  z-index: 2;
  bottom: 0;
  height: 6rem;
  margin: 0;
  left: -1px;
  width: calc(100% + 2px);
  cursor: pointer;
  -webkit-appearance: slider-horizontal !important;
  -moz-appearance: none;
  opacity: 0;
  -ms-touch-action: auto;
  touch-action: auto;

  &::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 300vh;
  }
  &::-moz-range-thumb {
    -webkit-appearance: none;
    height: 300vh;
  }
  &::-ms-tooltip {
    display: none;
  }
}

.beer-ready {
  &,
  image,
  .beer-reveal,
  .beer-handle {
    opacity: 1;
  }
}

.beer-slider {
  width: 100%;
  height: 70vh;
}
.ctnr {
  height: 70vh;
}

.beer-handle {
  position: absolute;
  z-index: 2;
  pointer-events: none;
  opacity: 0;
  background: white;
  color: #000;
  transition: opacity 1s;
  transform: translateX(-50%);
  height: 6rem;
  width: 100%;
  left: 50%;
  bottom: 0;
  clip-path: url(#svgPath);
  &:before,
  &:after {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    top: 50%;
    border-top: solid 2px;
    border-left: solid 2px;
    transform-origin: 0 0;
  }
  &:before {
    left: calc(50% - 20px);
    transform: rotate(-45deg);
  }
  &:after {
    right: calc(50% - 30px);
    transform: rotate(135deg);
  }
}

body {
  font-family: Poppins, sans-serif;
  line-height: 1.6;
}

h1,
h2 {
  font-family: Calistoga;
  font-weight: 400;
}
h1 {
  margin: 0;
}
h2 {
  font-size: 4rem;
  line-height: 1;
}
.b {
  position: absolute;
  top: 2rem;
  width: 50%;
  max-width: 700px;
}
.b * {
  opacity: 0;
  transform: translate3d(0, 2rem, 0);
  transition: 1s;
}
.b1 {
  left: 4rem;
  z-index: 1;
  color: white;
}
.b2 {
  right: 4rem;
  z-index: 1;
}

.more .b1 * {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.less .b2 * {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}
.ctnr:after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
.ctnr-summer:after {
  background: linear-gradient(135deg, #2a2d4e, transparent);
}

.ctnr-winter:after {
  background: linear-gradient(-135deg, white, transparent);
}

image {
  transition: 0.6s;
  opacity: 0;
}

p {
  letter-spacing: 1px;
}

@media (max-width: 37.5em) {
  h2 {
    font-size: 2rem;
  }
  .b1 {
    left: 2rem;
  }
  .b2 {
    right: 2rem;
  }
  .ctnr-summer:after {
    background: linear-gradient(180deg, #2a2d4e, transparent 120%);
  }
}

main {
  margin: 2rem auto;
  max-width: 48rem;
  padding: 0 1rem;
}

              
            
!

JS

              
                class BeerSlider {
  constructor(element, { start = "50" } = {}) {
    this.start = parseInt(start)
      ? Math.min(100, Math.max(0, parseInt(start)))
      : 50;
    this.element = element;
    this.revealContainer = this.element.children[1];
    this.revealElement = this.revealContainer.children[0];
    this.range = this.addElement("input", {
      type: "range",
      class: `beer-range`,
      "aria-label": "Percent of revealed content",
      "aria-valuemin": "0",
      "aria-valuemax": "100",
      "aria-valuenow": this.start,
      value: this.start,
      min: "0",
      max: "100"
    });
    this.handle = this.addElement("span", {
      class: `beer-handle`
    });
    this.onImagesLoad();
  }
  init() {
    this.element.classList.add(`beer-ready`);
    this.move();
    this.addListeners();
  }
  loadingImg(src) {
    return new Promise((resolve, reject) => {
      if (!src) {
        resolve();
      }
      const img = new Image();
      img.onload = () => resolve();
      img.onerror = () => reject();
      img.src = src;
    });
  }
  loadedBoth() {
    const mainImageSrc =
      this.element.children[0].src ||
      this.element.children[0].getAttribute(`data-beer-src`);
    const revealImageSrc =
      this.revealElement.src ||
      this.revealElement.getAttribute(`data-beer-src`);
    return Promise.all([
      this.loadingImg(mainImageSrc),
      this.loadingImg(revealImageSrc)
    ]);
  }
  onImagesLoad() {
    if (!this.revealElement) {
      return;
    }
    this.loadedBoth().then(
      () => {
        this.init();
      },
      () => {
        console.error("Some errors occurred and images are not loaded.");
      }
    );
  }
  addElement(tag, attributes) {
    const el = document.createElement(tag);
    Object.keys(attributes).forEach((key) => {
      el.setAttribute(key, attributes[key]);
    });
    this.element.appendChild(el);
    return el;
  }
  addListeners() {
    const eventTypes = ["input", "change"];
    eventTypes.forEach((i) => {
      this.range.addEventListener(i, () => {
        this.move();
      });
    });
  }
  move() {
    this.revealContainer.style.setProperty("--width", `${this.range.value}%`);
    this.handle.style.left = `${this.range.value}%`;
    this.range.setAttribute("aria-valuenow", this.range.value);
    if (this.range.value > 55) {
      this.element.classList.add("more");
    } else {
      this.element.classList.remove("more");
      if (this.range.value < 45) {
        this.element.classList.add("less");
      } else {
        this.element.classList.remove("less");
      }
    }
  }
}

new BeerSlider(document.getElementById("slider"), { start: 30 });

              
            
!
999px

Console