CSS Only Envelope reveal invitation

by dhavaljani

HTML

<div class="envelope-container">
  <div class="envelope">
    <div class="top-flap"></div>
    <div class="letter">
       <img src="https://assets.ppassets.com/p-4z7unbMGB16SwkA44oJ5mC/flyer/paper_static/base" alt="Reyansh's Janoi Invitation" class="invitation-image">
    </div>
    <div class="bottom-flap"></div>
  </div>
</div>

CSS

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

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #f5f5f5;
}

/* Envelope Container */
.envelope-container {
  position: relative;
  width: 400px;
  height: 300px;
}

/* Envelope */
.envelope {
  position: relative;
  width: 100%;
  height: 100%;
}

/* Top Flap */
.top-flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background-color: #d4a76a;
  transform-origin: top center;
  transition: transform 1s ease-in-out;
}

/* Bottom Flap */
.bottom-flap {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background-color: #e8c093;
}

/* Letter (Invitation) */
.letter {
  position: absolute;
  top: calc(50% - 10px);
  left: calc(50% - 150px);
  width: calc(100% - 40px);
  height: auto; /* Let the image determine the height */
}

.invitation-image {
  width: auto;

}