HTML Animated Love Letter Envelope with GSAP

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<body class="scissors">
  <div class="envelop">
    <div class="envelop__front-paper"></div>
    <div class="envelop__back-paper"></div>
    <div class="envelop__up-paper js-up-paper"></div>
    <div class="envelop__sticker js-sticker"></div>
    <div class="envelop__false-sticker"></div>
    <div class="envelop__content js-envelop-content">
      <div class="love-notes">
        <div class="note js-note">
          <div class="note__text">
            <p>
              Hi my princess, here we are completing another month together, it is always a joy to be able to wake up and know that I have you by my side and feel that this will be forever, it is magnificent.
            </p>
          </div>
        </div>
        <div class="note js-note">
          <div class="note__text">
            <p>I want them to never end and for there to always be many more ahead.</p>
          </div>
        </div>
        <div class="note js-note">
          <div class="note__text">
            <p>You are the best thing that ever happened to me, thank you for choosing me every day.</p>
            <p>I love you a lot!♥.</p>
          </div>
        </div>
      </div>
    </div>
  </div>
</body>

</html>
  <script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/3.6.0/gsap.min.js'></script><script  src="./script.js"></script>

</body>
</html>

CSS

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

html,
body {
  height: 100%;
}

body {
  width: 100%;
  background-color: #dd84d3;
  font-size: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}
@media (max-height: 500px) {
  body {
    margin: 25% 0 25% 0;
  }
}

.envelop {
  width: 15rem;
  height: 10rem;
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;
}
@media (min-width: 400px) and (max-width: 600px) {
  .envelop {
    width: 20rem;
    height: 15rem;
  }
}
@media (min-width: 600px) {
  .envelop {
    width: 25rem;
    height: 20rem;
  }
}
@media (min-width: 600px) and (min-height: 600px) {
  .envelop {
    bottom: 20%;
  }
}
.envelop__front-paper {
  width: 100%;
  height: 100%;
  bottom: 0;
  left: 0;
  position: absolute;
  border-radius: 0.7rem;
  border: 0.35rem solid #967b5c;
  background-color: #ba9872;
  clip-path: polygon(100% 0%, 50% 70%, 0% 0%, 0% 100%, 100% 100%);
  z-index: 300;
}
.envelop__back-paper {
  width: 100%;
  height: 100%;
  bottom: 0;
  left: 0;
  position: absolute;
  border-radius: 0.7rem;
  background-color: #967b5c;
  clip-path: polygon(0% 0%, 100% 0%, 90% 100%, 0% 90%);
  z-index: 100;
}
.envelop__up-paper {
  width: 100%;
  height: 100%;
  bottom: 0;
  left: 0;
  position: relative;
  border-radius: 0.7rem;
  background-color: #967b5c;
  z-index: 400;
  clip-path: polygon(0% 0%, 100% 0%, 50% 81%);
}
.envelop__sticker {
  width: 100%;
  height: 20%;
  position: absolute;
  margin: auto;
  top: 30%;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: 400;
  background-image: url("https://www.freepnglogos.com/uploads/heart-png/emoji-heart-33.png");
  background-color: #f9f9f9;
  border: 0.3rem solid #e2e2e2;
  background-size: 2rem;
  background-position: center;
}
@media (max-width: 400px) {
  .envelop__sticker {
    background-size: 1.2rem;
  }
}
@media (min-width: 600px) {
  .envelop__sticker {
    height: 15%;
  }
}
.envelop__false-sticker {
  width: 20%;
  height: 20%;
  position: absolute;
  margin: auto;
  top: 30%;
  left: 80%;
  bottom: 0;
  right: 0;
  z-index: 300;
  background-image: url("https://www.freepnglogos.com/uploads/heart-png/emoji-heart-33.png");
  background-color: #f9f9f9;
  border: 0.3rem solid #e2e2e2;
  background-size: 2rem;
  background-position: center;
}
@media (max-width: 400px) {
  .envelop__false-sticker {
    background-size: 1.2rem;
  }
}
@media (min-width: 600px) {
  .envelop__false-sticker {
    height: 15%;
  }
}
.envelop__content {
  width: 100%;
  height: 100%;
  bottom: 0;
  left: 0;
  position: absolute;
  z-index: 200;
}
.love-notes {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.note {
  width: 95%;
  height: 30%;
  background-color: #f9f9f9;
  position: absolute;
  overflow: hidden;
  transition: height 0.5s, opacity 0.25s;
  box-shadow: 0px 0px 5px 0px rgba(0, 0, 0, 0.75);
}
.note:nth-child(1) {
  bottom: 60%;
}
.note:nth-child(2) {
  bottom: 40%;
}
.note:nth-child(3) {
  bottom: 20%;
}
.note:hover {
  cursor: pointer;
  height: 45%;
}
.note__text {
  font-family: "Sofia";
  padding: 1rem;
}
.note__text p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
  text-align: center;
}
@media (min-width: 300px) and (max-width: 600px) {
  .note__text p {
    font-size: 1.025rem;
  }
}
@media (min-width: 600px) {
  .note__text p {
    font-size: 1.15rem;
  }
}

.scissors {
  cursor: url("https://i.postimg.cc/GtLCdKxR/sisors.png"), pointer;
}
.scissors:active {
  cursor: url("https://i.postimg.cc/GtXQ7WPZ/pngwing-com.png"), pointer;
}

.cursor {
  cursor: pointer;
}

let mobile_media_query = window.matchMedia("(max-width: 400px)");
let tablet_media_query = window.matchMedia(
  "(min-width: 400px) and (max-width: 600px)"
);
const notes = document.querySelectorAll(".js-note");

//-> Main function that enables all the notes.
function notes_ready() {
  gsap.to(".js-envelop-content", {
    height: "110%",
    duration: 0.5
  });

for (let i = 0; i < notes.length; i++) {
    notes[i].addEventListener("click", function () {
      if (mobile_media_query.matches) {
        if (this.classList.contains("active")) {
          this.classList.remove("active");
          gsap.set(this, {
            height: "30%",
            clearProps: "all"
          });
        } else {
          for (let i = 0; i < notes.length; i++) {
            if (notes[i].classList.contains("active")) {
              notes[i].classList.remove("active");
              gsap.set(notes[i], {
                height: "30%",
                clearProps: "all"
              });
            }
          }
          this.classList.add("active");
          gsap.set(this, {
            height: 125 + 40 * i + "%"
          });
        }
      } else if (tablet_media_query.matches) {
        if (this.classList.contains("active")) {
          this.classList.remove("active");
          gsap.set(this, {
            height: "30%",
            clearProps: "all"
          });
        } else {
          for (let i = 0; i < notes.length; i++) {
            if (notes[i].classList.contains("active")) {
              notes[i].classList.remove("active");
              gsap.set(notes[i], {
                height: "30%",
                clearProps: "all"
              });
            }
          }
          this.classList.add("active");
          gsap.set(this, {
            height: 80 + 21 * i + "%"
          });
        }
      } else {
        if (this.classList.contains("active")) {
          this.classList.remove("active");
          gsap.set(this, {
            height: "30%",
            clearProps: "all"
          });
        } else {
          for (let i = 0; i < notes.length; i++) {
            if (notes[i].classList.contains("active")) {
              notes[i].classList.remove("active");
              gsap.set(notes[i], {
                height: "30%",
                clearProps: "all"
              });
            }
          }
          this.classList.add("active");
          gsap.set(this, {
            height: 70 + 20 * i + "%"
          });
        }
      }
    });
  }
}

//-> Function that set up the up paper of the envelope.
function set_up_paper() {
  var arr = [0, 0, 100, 0, 50, 61];
  gsap.set(".js-up-paper", {
    bottom: "97%",
    rotation: 180,
    zIndex: 200,
    clipPath:
      "polygon(" +
      arr[0] +
      "%" +
      arr[1] +
      "%," +
      arr[2] +
      "%" +
      arr[3] +
      "%," +
      arr[4] +
      "%" +
      arr[5] +
      "%)",
    onComplete: notes_ready
  });
}

//-> Function that starts the up paper transition.
function envelop_transition() {
  gsap.to(".js-up-paper", {
    bottom: "1%",
    duration: 0.25,
    onComplete: set_up_paper
  });
  document
    .querySelector(".js-up-paper")
    .removeEventListener("click", envelop_transition);
  document.querySelector(".js-up-paper").classList.remove("cursor");
}

//-> Function that allows cut the sticker.
function sticker() {
  gsap.set(".js-sticker", { width: "20%", left: "-80%" });
  document.body.classList.remove("scissors");
  document.querySelector(".js-sticker").removeEventListener("click", sticker);
  document
    .querySelector(".js-up-paper")
    .addEventListener("click", envelop_transition);
  document.querySelector(".js-up-paper").classList.add("cursor");
}

document.querySelector(".js-sticker").addEventListener("click", sticker);

window.onresize = function (event) {
  recize_notes();
};

HTML Animated Love Letter Envelope with GSAP

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