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HTML 

              
                <body translate="no">
  <div class="app">
    <div class="title">GRID</div>
    <div class="gallery">

      <div class="originalContainer">
        <span id="vertical-l"></span>
        <span id="bottom"></span>
        <span id="vertical-r"></span>
      </div>

      <div class="originalContainer">
        <span id="vertical-r"></span>

      </div>

      <div class="originalContainer">
        <span id="vertical-r"></span>

      </div>

      <div class="originalContainer">
        <span id="vertical-r"></span>
      </div>

      <div class="originalContainer">
        <span id="bottom"></span>
      </div>

      <div class="originalContainer">
      </div>

      <div class="originalContainer">
      </div>

      <div class="originalContainer">
      </div>
      <div class="originalContainer">
      </div>
      <div class="originalContainer">
      </div>
      <div class="originalContainer">
      </div>

      <div class="originalContainer">
      </div>

    </div>
  </div>
</body>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Nixie+One&display=swap");

html,
body {
  width: 100%;
  height: 100%;
  background: #efebe0;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.app {
  height: 100%;
  width: 40%;
  padding-top: 3.5%;
  display: block;
  /*position: relative;*/
  background: #efebe0;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;

  /* Hide the app on load */
  /* visibility: hidden;*/
}

/*
originalContainer {
  width: 100%;
}
*/

.gallery {
  max-width: 900px;
  max-height: 800px;
  margin: 0 auto;
  display: grid;
  gap: 0rem;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  grid-template-rows: repeat(auto-fit, minmax(150px, 1fr));
}

.title {
  font-family: "Nixie One";
  display: block;
  text-align: center;
  font-size: 5.5vw;
  padding-bottom: 20px;
  z-index: 50;
  color: #0177ff;
}

.originalContainer {
  border-right: 0px solid #0177ff;
  border-bottom: 0px solid #0177ff;
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  position: relative;
}

.gallery div:nth-child(4n) {
  border-right: none;
}
.gallery div:nth-child(8) ~ div {
  border-bottom: none;
}

.item {
  cursor: pointer;
  font-size: 0;
}

.newContainer {
  position: absolute;
  top: 50%; /* position the top  edge of the element at the middle of the parent */
  left: 50%; /* position the left edge of the element at the middle of the parent */
  transform: translate(-50%, -50%);
  width: 300px;
  height: 300px;
  z-index: 1;
  visibility: hidden;
}

.newContainer > * {
  margin-bottom: 1rem;
}

.detail .title {
  font-size: 2rem;
  text-transform: uppercase;
}

.detail .secondary {
  color: lightgray;
}

.detail .description {
  line-height: 1.5;
}
.box {
  height: 100%;
  width: 100%;
}

.fixed {
  top: 5%;
  left: 5%;
  position: fixed;
  width: 90%;
  height: 90%;
  border: solid 1px #0177ff;
  z-index: 999;
}

#bottom {
  position: absolute;
  background: none transparent;
  bottom: 0;
  left: 0;
  width: 200px;
  height: 1px;
  z-index: 1;
}

#vertical-r {
  position: absolute;
  background: none transparent;
  right: 0;
  top: 0;
  height: 200px;
  width: 1px;
  z-index: 1;
}

#vertical-l {
  position: absolute;
  background: none transparent;
  left: 0;
  top: 0;
  height: 200px;
  width: 1px;
  z-index: 1;
}
!

JS 

              
                // set initial state
gsap.set("#bottom", { backgroundColor: "#0177FF", width: 0 });
gsap.set("#vertical-r, #vertical-l", { height: 0, backgroundColor: "#0177FF" });
gsap.set(".lottieHolder", { autoAlpha: 0 });

let gridTL; // store the timeline in an external variable so it persists and we can kill() it before recreating a new one.

function drawGrid() {
  let gridWidth = gsap.getProperty(".gallery", "width", "px");
  let gridHeight = gsap.getProperty(".gallery", "height", "px");
  gridTL && gridTL.kill();

  gridTL = gsap.timeline();

  gridTL.to("#bottom", {
    stagger: {
      amount: 0.2,
      ease: "power4"
    },
    width: gridWidth
  });

  gridTL.to(
    "#vertical-r, #vertical-l",
    {
      stagger: {
        amount: 0.5,
        ease: "power4"
      },
      height: gridHeight
    },
    ">-0.5"
  );

  gridTL.to(
    ".lottieHolder",
    {
      stagger: {
        amount: 1,
        ease: "power2"
      },
      autoAlpha: 1,
      duration: 2.75
    },
    ">-1"
  );
}

drawGrid();

window.addEventListener("resize", drawGrid);
!
999px

Console