Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ 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 class="wrapper">
  <div class="wrapper__inner">
    <svg viewBox="0 0 1200 630" xmlns="http://www.w3.org/2000/svg" class="social-image">
      <style>
        * {
          margin: 0;
          padding: 0;
          box-sizing: border-box;
        }

        .social-image {
          --align-text-x: flex-start;
          --align-text-y: flex-end;

          width: 100%;
          background: #f5f7fa;
          font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
          line-height: 1;
        }

        .social-image__html {
          display: flex;
          height: 100%;
          justify-content: var(--align-text-x);
          align-items: var(--align-text-y);
          padding: 72px;

        }

        .social-image__text {
          max-width: 700px;
        }

        .social-image__title {
          font-size: 56px;
          line-height: 68px;
          font-weight: 800;
          margin-bottom: 24px;
          letter-spacing: -0.0125em;
          outline: none;
        }

        .social-image__meta {
          grid-column: 2;
          font-weight: 500;
          font-size: 24px;
          line-height: 36px;
          outline: none;
          letter-spacing: -0.0125em;
        }
      </style>
      <g>
        <foreignObject x="0" y="0" width="1200" height="630">
          <div class="social-image__html">
            <div class="social-image__text">
              <h1 xmlns="http://www.w3.org/1999/xhtml" class="social-image__title" contentEditable>All of this text is editable...
                click on it and start typing!</h1>
              <h2 xmlns="http://www.w3.org/1999/xhtml" class="social-image__meta" contentEditable>As you type, the background will adapt itself to the text, making sure the shapes never overlap.</h2>
            </div>
          </div>
        </foreignObject>
      </g>
    </svg>
  </div>
  <div class="controls">

    <div class="controls__randomize">
      <p class="controls__label">Randomize:</p>
      <button class="controls__btn controls__btn--alignment">Alignment</button>
      <button class="controls__btn controls__btn--colors">Colors</button>
      <button class="controls__btn controls__btn--shapes">Shapes</button>
    </div>
    <button class="controls__btn controls__btn--save">Save</button>
    <p class="controls__saving-disabled">Saving is disabled on mobile devices</p>
  </div>

</div>
              
            
!

CSS

              
                * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --black: hsl(0, 0%, 10%);
}

body {
  width: 100vw;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  color: var(--black);
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrapper {
  width: 100%;
  max-width: 60rem;
  min-width: 20rem;
  margin: 0 auto;
  overflow: hidden;
}

.controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.controls__label {
  margin-right: 1rem;
  font-weight: 500;
  font-size: 1rem;
}

.controls__randomize {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  flex-wrap: wrap;
}

.controls__btn {
  width: 8rem;
  height: 2.25rem;
  margin-right: 1rem;
  background: #fff;
  border-radius: 0;
  border: none;
  border: 2px solid var(--black);
  font-family: inherit;
  color: var(--black);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
}

.controls__btn:hover {
  background: var(--black);
  color: #fff;
}

.controls__btn--save {
  position: relative;
  margin-left: auto;
  margin-right: 0;
  background: var(--black);
  color: #fff;
}

.controls__btn--save:hover {
  background: #fff;
  color: var(--black);
}

.controls__saving-disabled {
  font-size: 0.875rem;
  margin-top: 2rem;
  font-weight: 500;
  display: none;
  font-style: italic;
}

@media only screen and (max-width: 800px) {
  body {
    padding: 0.75rem;
  }

  .controls__btn {
    width: 6rem;
    height: 2rem;
    font-size: 0.875rem;
    margin-top: 0.75rem;
  }

  .controls__label {
    font-size: 0.875rem;
    margin-right: 0.5rem;
    width: 100%;
  }
  .controls__btn--save {
    width: 100%;
    margin-top: 1.25rem;
  }
}

@media only screen and (max-width: 480px) {
  .controls__btn {
    margin-right: 0.5rem;
  }

  .controls__btn--save {
    display: none;
  }

  .controls__saving-disabled {
    width: 100%;
    display: block;
  }
}

              
            
!

JS

              
                import { SVG } from "https://cdn.skypack.dev/@svgdotjs/svg.js";
import html2canvas from "https://cdn.skypack.dev/html2canvas@1.0.0-rc.7";
import ResizeObserver from "https://cdn.skypack.dev/resize-observer-polyfill@1.5.1";
import FileSaver from "https://cdn.skypack.dev/file-saver@2.0.5";

console.clear();

const socialImageSVG = document.querySelector(".social-image");
const socialImageTitle = document.querySelector(".social-image__title");
const socialImageMeta = document.querySelector(".social-image__meta");

const saveBtn = document.querySelector(".controls__btn--save");
const alignmentBtn = document.querySelector(".controls__btn--alignment");
const colorBtn = document.querySelector(".controls__btn--colors");
const shapesBtn = document.querySelector(".controls__btn--shapes");

let baseColor;
let baseColorWhite;
let baseColorBlack;

let complimentaryColor1;
let complimentaryColor2;

let shapeColors;

const alignmentOpts = ["flex-start", "flex-end", "center"];

const shapes = SVG(socialImageSVG).group();

setColors();
generate();

const resizeObserver = new ResizeObserver(() => {
  generate();
});

resizeObserver.observe(socialImageTitle);
resizeObserver.observe(socialImageMeta);

function generate() {
  shapes.clear();

  const htmlRects = [
    relativeBounds(socialImageSVG, socialImageTitle),
    relativeBounds(socialImageSVG, socialImageMeta)
  ];

  const rects = generateRandomRects(htmlRects);

  for (const rect of rects.slice(2, rects.length)) {
    drawRandomShape(rect);
  }
}

function setColors() {
  const baseHue = random(0, 360);
  const saturation = random(60, 90);

  baseColor = `hsl(${baseHue}, ${saturation}%, 60%)`;
  baseColorWhite = `hsl(${baseHue}, ${saturation}%, 97%)`;
  baseColorBlack = `hsl(${baseHue}, 95%, 3%)`;

  complimentaryColor1 = `hsl(${baseHue + 90}, ${saturation}%, 60%)`;
  complimentaryColor2 = `hsl(${baseHue + 180}, ${saturation}%, 60%)`;

  shapeColors = [complimentaryColor1, complimentaryColor2, baseColor];

  socialImageSVG.style.background = baseColorWhite;
  socialImageSVG.style.color = baseColorBlack;
}

function drawRandomShape({ x, y, width, height }) {
  const shapeChoices = ["rect", "ellipse", "triangle"];
  let shape;

  switch (shapeChoices[~~random(0, shapeChoices.length)]) {
    case "ellipse":
      shape = shapes.ellipse(width, height).x(x).y(y);
      break;
    case "triangle":
      shape = shapes
        .polygon(`0 ${height}, ${width / 2} 0, ${width} ${height}`)
        .x(x)
        .y(y);
      break;
    default:
      shape = shapes.rect(width, height).x(x).y(y);
  }

  const color = randomColor();

  if (random(0, 1) > 0.25) {
    shape.fill(color);
  } else {
    shape
      .stroke({
        color,
        width: 16
      })
      .fill("transparent");
  }

  shape.node.classList.add("shape");
  shape.rotate(random(0, 90)).scale(0.825);
  shape.opacity(random(0.5, 1));
}

function randomColor() {
  return shapeColors[~~random(0, shapeColors.length)];
}

function randomAlignment() {
  return alignmentOpts[~~random(0, alignmentOpts.length)];
}

function generateRandomRects(existing) {
  const rects = [...existing];
  const tries = 250;
  const maxShapes = 6;

  for (let i = 0; i < tries; i++) {
    if (rects.length === maxShapes + existing.length) break;

    const size = random(100, 600);

    const rect = {
      x: random(-size, 1200),
      y: random(-size, 630),
      width: size,
      height: size
    };

    if (!rects.some((r) => detectRectCollision(r, rect))) {
      rects.push(rect);
    }
  }

  return rects;
}

function random(min, max) {
  return Math.random() * (max - min) + min;
}

function detectRectCollision(rect1, rect2, padding = 32) {
  return (
    rect1.x < rect2.x + rect2.width + padding &&
    rect1.x + rect1.width + padding > rect2.x &&
    rect1.y < rect2.y + rect2.height + padding &&
    rect1.y + rect1.height + padding > rect2.y
  );
}

function relativeBounds(svg, HTMLElement) {
  const { x, y, width, height } = HTMLElement.getBoundingClientRect();

  const startPoint = svg.createSVGPoint();
  startPoint.x = x;
  startPoint.y = y;

  const endPoint = svg.createSVGPoint();
  endPoint.x = x + width;
  endPoint.y = y + height;

  const startPointTransformed = startPoint.matrixTransform(
    svg.getScreenCTM().inverse()
  );
  const endPointTransformed = endPoint.matrixTransform(
    svg.getScreenCTM().inverse()
  );

  return {
    x: startPointTransformed.x,
    y: startPointTransformed.y,
    width: endPointTransformed.x - startPointTransformed.x,
    height: endPointTransformed.y - startPointTransformed.y
  };
}

// regenerate our shapes and shape positions
shapesBtn.addEventListener("click", () => {
  generate();
});

// set new random color values and update the existing shapes with these colors
colorBtn.addEventListener("click", () => {
  setColors();

  // find all the shapes in our svg and update their fill / stroke
  socialImageSVG.querySelectorAll(".shape").forEach((node) => {
    if (node.getAttribute("stroke")) {
      node.setAttribute("stroke", randomColor());
    } else {
      node.setAttribute("fill", randomColor());
    }
  });
});

// choose random new alignment options and update the CSS custom properties, regenerate the shapes
alignmentBtn.addEventListener("click", () => {
  socialImageSVG.style.setProperty(
    "--align-text-x",
    alignmentOpts[~~random(0, alignmentOpts.length)]
  );
  socialImageSVG.style.setProperty(
    "--align-text-y",
    alignmentOpts[~~random(0, alignmentOpts.length)]
  );
  generate();
});

// save our social image as a .png file
saveBtn.addEventListener("click", () => {
  const bounds = socialImageSVG.getBoundingClientRect();

  // on save, update the dimensions of our social image so that it exports as expected
  socialImageSVG.style.width = "1200px";
  socialImageSVG.style.height = "630px";
  socialImageSVG.setAttribute("width", 1200);
  socialImageSVG.setAttribute("height", 630);
  // this fixes an odd visual "cut off" bug when exporting
  window.scrollTo(0, 0);

  html2canvas(document.querySelector(".wrapper__inner"), {
    width: 1200,
    height: 630,
    scale: 2 // export our image at 2x resolution so it is nice and crisp on retina devices
  }).then((canvas) => {
    canvas.toBlob(function (blob) {
      // restore the social image styles
      socialImageSVG.style.width = "100%";
      socialImageSVG.style.height = "auto";
      socialImageSVG.setAttribute("width", "");
      socialImageSVG.setAttribute("height", "");

      FileSaver.saveAs(blob, "generative-social-image.png");
    });
  });
});

              
            
!
999px

Console