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HTML 

              
                    <div class="anchor-element js-anchor-element">
      <svg
        xmlns="http://www.w3.org/2000/svg"
        viewBox="0 -960 960 960"
        width="24"
      >
        <path
          d="M480-80q-61 0-125-22t-116-60q-52-38-85.5-89T120-360v-120l160 120-62 62q29 51 92 88t130 47v-357H320v-80h120v-47q-35-13-57.5-43.5T360-760q0-50 35-85t85-35q50 0 85 35t35 85q0 39-22.5 69.5T520-647v47h120v80H520v357q67-10 130-47t92-88l-62-62 160-120v120q0 58-33.5 109T721-162q-52 38-116 60T480-80Zm0-640q17 0 28.5-11.5T520-760q0-17-11.5-28.5T480-800q-17 0-28.5 11.5T440-760q0 17 11.5 28.5T480-720Z"
        />
      </svg>
    </div>

    <div class="anchor-element js-anchor-element">
      <svg
        xmlns="http://www.w3.org/2000/svg"
        viewBox="0 -960 960 960"
        width="24"
      >
        <path
          d="M480-80q-61 0-125-22t-116-60q-52-38-85.5-89T120-360v-120l160 120-62 62q29 51 92 88t130 47v-357H320v-80h120v-47q-35-13-57.5-43.5T360-760q0-50 35-85t85-35q50 0 85 35t35 85q0 39-22.5 69.5T520-647v47h120v80H520v357q67-10 130-47t92-88l-62-62 160-120v120q0 58-33.5 109T721-162q-52 38-116 60T480-80Zm0-640q17 0 28.5-11.5T520-760q0-17-11.5-28.5T480-800q-17 0-28.5 11.5T440-760q0 17 11.5 28.5T480-720Z"
        />
      </svg>
    </div>

    <div class="anchor-positioned-element">
      <h2>Drag the anchors to size me!</h2>
    </div>
!

CSS 

              
                @layer tokens, reset, animations, base, components, theme, demo;

@layer demo {
  .anchor-element {
    position: absolute;
    cursor: grab;
    z-index: 1;

    &:active {
      cursor: grabbing;
    }

    &:nth-of-type(1) {
      top: var(--y, var(--size-4));
      left: var(--x, var(--size-4));
      anchor-name: --anchor-element-one;
    }

    &:nth-of-type(2) {
      top: var(--y, calc(100% - var(--size-8) - var(--size-4)));
      left: var(--x, calc(100% - var(--size-8) - var(--size-4)));
      anchor-name: --anchor-element-two;
    }
  }

  .anchor-positioned-element {
    position: absolute;
    top: anchor(--anchor-element-one bottom);
    left: anchor(--anchor-element-one right);
    right: anchor(--anchor-element-two left);
    bottom: anchor(--anchor-element-two top);

    display: grid;
    overflow: clip;
    white-space: nowrap;
    padding: var(--size-2) var(--size-3);

    place-items: center;
    background-color: var(--surface-2);
    border: 1px solid var(--gray-7);
  }

  h2 {
    color: var(--gray-7);
    font-size: var(--font-size-5);

    &::selection {
      background-color: transparent;
    }
  }
}

@layer tokens {
  :where(html) {
    --gray-0: rgb(248, 249, 250);
    --gray-1: rgb(241, 243, 245);
    --gray-2: rgb(233, 236, 239);
    --gray-3: rgb(222, 226, 230);
    --gray-4: rgb(206, 212, 218);
    --gray-5: rgb(173, 181, 189);
    --gray-6: rgb(134, 142, 150);
    --gray-7: rgb(73, 80, 87);
    --gray-8: rgb(52, 58, 64);
    --gray-9: rgb(33, 37, 41);

    --blue-0: rgb(231, 245, 255);
    --blue-1: rgb(208, 235, 255);
    --blue-2: rgb(165, 216, 255);
    --blue-3: rgb(116, 192, 252);
    --blue-4: rgb(77, 171, 247);
    --blue-5: rgb(51, 154, 240);
    --blue-6: rgb(34, 139, 230);
    --blue-7: rgb(28, 126, 214);
    --blue-8: rgb(25, 113, 194);
    --blue-9: rgb(24, 100, 171);

    --indigo-0: #edf2ff;
    --indigo-1: #dbe4ff;
    --indigo-2: #bac8ff;
    --indigo-3: #91a7ff;
    --indigo-4: #748ffc;
    --indigo-5: #5c7cfa;
    --indigo-6: #4c6ef5;
    --indigo-7: #4263eb;
    --indigo-8: #3b5bdb;
    --indigo-9: #364fc7;

    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --sharp: cubic-bezier(0.4, 0, 0.6, 1);
    --ease-spring: linear(
      0,
      0.006,
      0.025 2.8%,
      0.101 6.1%,
      0.539 18.9%,
      0.721 25.3%,
      0.849 31.5%,
      0.937 38.1%,
      0.968 41.8%,
      0.991 45.7%,
      1.006 50.1%,
      1.015 55%,
      1.017 63.9%,
      1.001
    );

    --font-family-system: system-ui, sans-serif;
    --font-family-sans-serif: Inter, Roboto, Helvetica Neue, Arial Nova,
      Nimbus Sans, Arial, sans-serif;

    --font-line-height-1: 1;
    --font-line-height-2: 1.25;
    --font-line-height-3: 1.375;
    --font-line-height-4: 1.5;

    --font-size-1: 1rem;
    --font-size-2: 1.1rem;
    --font-size-3: 1.25rem;
    --font-size-4: 1.5rem;
    --font-size-5: 2rem;
    --font-size-6: 2.5rem;
    --font-size-7: 3rem;
    --font-size-8: 3.5rem;

    --font-weight-1: 100;
    --font-weight-2: 200;
    --font-weight-3: 300;
    --font-weight-4: 400;
    --font-weight-5: 500;
    --font-weight-6: 600;
    --font-weight-7: 700;
    --font-weight-8: 800;
    --font-weight-9: 900;

    --size-1: 0.5rem;
    --size-2: calc(2 * var(--size-1));
    --size-3: calc(3 * var(--size-1));
    --size-4: calc(4 * var(--size-1));
    --size-5: calc(5 * var(--size-1));
    --size-6: calc(6 * var(--size-1));
    --size-7: calc(7 * var(--size-1));
    --size-8: calc(8 * var(--size-1));
    --size-9: calc(9 * var(--size-1));
    --size-10: calc(10 * var(--size-1));

    --radius-1: 1rem;

    --duration-1: 100ms;
    --duration-2: 150ms;
    --duration-3: 200ms;
    --duration-4: 400ms;
  }
}

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

  :where(*) {
    margin: 0;
    padding: 0;
  }

  :where(h1, h2, h3, h4, h5, h6) {
    font-weight: var(--font-weight-9);
    line-height: var(--font-line-height-1);
  }

  :where(h1) {
    font-size: var(--font-size-8);
  }

  :where(h2) {
    font-size: var(--font-size-6);
  }

  :where(h3) {
    font-size: var(--font-size-5);
  }

  :where(h4) {
    font-size: var(--font-size-4);
  }

  :where(h5) {
    font-size: var(--font-size-3);
  }

  :where(a[href]) {
    color: var(--link);
  }

  :where(a[href]):where(:visited) {
    color: var(--link-visited);
  }

  :focus-visible {
    outline-color: var(--brand, var(--link));
  }

  :where(input, button, textarea, select),
  :where(input[type="file"])::-webkit-file-upload-button {
    font: inherit;
    font-size: inherit;
    color: inherit;
    letter-spacing: inherit;
  }

  ::placeholder {
    color: var(--gray-3);
    opacity: 0.75;
  }

  :where(input:not([type="range"]), textarea, select) {
    padding: 0.5rem 0.25rem;
  }

  :where(textarea, select, input:not(button)) {
    background-color: var(--surface-2);
  }

  :where(ul[class]) {
    list-style: none;
  }

  fieldset {
    border: 0;
    margin: 0;
    padding: 0;
  }

  legend {
    font-weight: 600;
    font-size: 1.25rem;
    margin-bottom: var(--size-2);
    padding-inline: var(--size-1);
  }
}

@layer animations {
  @keyframes scale-out {
    to {
      scale: 0;
    }
  }

  @keyframes fade-in {
    to {
      opacity: 1;
    }
  }
}

@layer base {
  :where(html) {
    height: 100%;
    display: grid;

    font-family: var(--font-family-sans-serif);
    line-height: var(--font-line-height-4);

    color: var(--text-1);
    background-color: var(--surface-1);
  }

  :where(body) {
    place-items: center;

    display: grid;
    overflow: hidden;

    &:before {
      content: "";

      top: 0;
      left: 0;
      z-index: -1;
      position: fixed;

      width: 100vw;
      height: 100vh;

      display: block;
      pointer-events: none;

      mask: linear-gradient(-30deg, transparent 50%, white);
      background: linear-gradient(
            90deg,
            var(--dot-bg) calc(var(--dot-space) - var(--dot-size)),
            transparent 1%
          )
          center / var(--dot-space) var(--dot-space),
        linear-gradient(
            var(--dot-bg) calc(var(--dot-space) - var(--dot-size)),
            transparent 1%
          )
          center / var(--dot-space) var(--dot-space),
        var(--dot-color);
    }
  }

  ::-webkit-scrollbar-track {
    background: transparent;
    cursor: pointer;
  }

  ::-webkit-scrollbar-thumb {
    background-color: var(--indigo-3);
    cursor: pointer;
    border-radius: var(--radius-1);
  }

  ::-webkit-scrollbar {
    height: var(--size-1);
    width: var(--size-1);
    background: transparent;
    cursor: pointer;
  }

  @media (prefers-reduced-motion: no-preference) {
    :where(*) {
      scroll-behavior: smooth;
    }
  }
}

@layer components {
  .container {
    width: 55ch;
    display: grid;

    gap: var(--size-2);
  }

  .chip {
    position: relative;

    cursor: pointer;

    border: 1px solid var(--gray-7);
    padding: var(--size-1) var(--size-2);

    border-radius: var(--radius-1);
    background-color: var(--surface-1);

    line-height: 1;
    transition: color var(--duration-4) var(--ease-spring),
      background-color var(--duration-4) var(--ease-spring);

    ::selection {
      background: transparent;
    }

    &:after {
      content: "";

      position: absolute;
      inset: -1px;

      color: inherit;
      opacity: 0;
      border-radius: inherit;
      pointer-events: none;

      border: 1px solid var(--pop);

      transition: opacity 400ms var(--ease-spring);
    }

    &:has(:checked) {
      color: var(--pop);
      background-color: var(--pop-dark);

      &:after {
        opacity: 1;
      }
    }

    &:hover:has(:not(:checked)) {
      background-color: var(--pop-dark);

      &:after {
        opacity: 0.2;
      }
    }

    [type="radio"] {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      white-space: nowrap;
      border-width: 0;
    }
  }

  .chip-list {
    flex-wrap: wrap;

    display: flex;
    list-style-type: none;

    gap: var(--size-1);
    margin: 0;
    padding: 0;
  }

  .message {
    --message-tip-size: var(--size-1);
    z-index: 100;

    padding: var(--size-1) var(--size-2);

    line-height: 1;
    white-space: nowrap;
    display: grid;
    place-items: center;

    border-radius: var(--radius-1);
    background-color: var(--surface-4);

    &.pointer {
      margin: var(--message-tip-size);

      &:after {
        content: " ";
        position: absolute;
        top: 100%;
        left: 50%;
        margin-left: calc(-1 * var(--message-tip-size));
        border-width: var(--message-tip-size);
        border-style: solid;
        border-color: var(--surface-4) transparent transparent transparent;
      }
    }
  }

  .anchor-element {
    anchor-name: --anchor-element;

    place-items: center;

    display: grid;

    width: var(--size-8);
    aspect-ratio: 1;
    border: 1px solid var(--divider);

    border-radius: 22%;
    background-color: var(--surface-2);

    > svg {
      width: 62%;

      display: block;
      opacity: 0.35;

      fill: var(--gray-1);
    }
  }
}

@layer theme {
  :where(html) {
    --pop: var(--indigo-3);
    --pop-dark: color-mix(in srgb, var(--pop) 10%, var(--surface-1));

    --surface-1: var(--gray-9);
    --surface-2: var(--gray-8);
    --surface-3: var(--gray-7);
    --surface-4: var(--gray-6);

    --divider: var(--gray-7);

    --text-1: var(--gray-1);
    --text-2: var(--gray-2);

    --link: var(--blue-6);
    --link-visited: var(--blue-4);

    --dot-bg: var(--surface-1);
    --dot-color: var(--gray-7);
    --dot-size: 0.125rem;
    --dot-space: 1.5rem;
  }
}
!

JS 

              
                
/**
 * Makes an element draggable by updating its position with custom CSS
 * properties --x and --y.
 *
 * @param {HTMLElement} element - The element to make draggable.
 */
function makeElementDraggable(element) {
  let xOffset = 0;
  let yOffset = 0;

  element.addEventListener("mousedown", onMouseDown);

  /**
   * Handles the mousedown event to initiate dragging.
   *
   * @param {MouseEvent} event - The mousedown event.
   */
  function onMouseDown(event) {
    xOffset = event.clientX;
    yOffset = event.clientY;

    document.addEventListener("mousemove", onMouseMove);
    document.addEventListener("mouseup", onMouseUp);
  }

  /**
   * Handles the mousemove event to update element position.
   *
   * @param {MouseEvent} event - The mousemove event.
   */
  function onMouseMove(event) {
    const deltaX = event.clientX - xOffset;
    const deltaY = event.clientY - yOffset;

    // Update offsets to current mouse position
    xOffset = event.clientX;
    yOffset = event.clientY;

    element.style.setProperty("--y", `${element.offsetTop + deltaY}px`);
    element.style.setProperty("--x", `${element.offsetLeft + deltaX}px`);
  }

  /**
   * Handles the mouseup event to stop dragging.
   */
  function onMouseUp() {
    document.removeEventListener("mouseup", onMouseUp);
    document.removeEventListener("mousemove", onMouseMove);
  }
}

// Bind the drag setup to all anchor elements
document.querySelectorAll(".js-anchor-element").forEach(makeElementDraggable);
!
999px

Console