body {
  margin: 0;
  height: 100vh;
  background-image: url('back.gif');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  flex-direction: column;
  justify-content: flex-end; 
  align-items: center;
  font-family: system-ui, sans-serif;
  text-align: center;
  padding-bottom: 0px;
}


.envelope {
  position: relative;
  width: 200px;
  height: 120px;
  cursor: pointer;
  margin-bottom: -50px;
}

.envelope .body {
  position: absolute;
  top: 0px;
  width: 100%;
  height: 110px;
  background: rgb(173, 217, 250);
  border-radius: 0 0 8px 8px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.envelope .flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100px; 
  background: rgb(147, 196, 252);
clip-path: polygon(0 0, 50% 85%, 100% 0);
  border-radius: 8px 8px 0 0; 
  z-index: 2; 
  transform-origin: top center; 
  transition: transform .4s ease;
}


/* when it opens */
#open-envelope:checked + label .flap {
  transform: rotateX(-180deg) translateY(120px);
}

.message {
  display:none;
  font-size: 1.75rem;
  color: rgb(244, 226, 244);
  margin: 40px 0 0 0;
}

.button {
  display:none;
  margin-top:20px;
  font-size: 1rem;
  border-color: #ffe4ec;
  background: #ffa9be;
  color:#ffe4ec
}

/*  after click */
#open-envelope:checked ~ .message {
  display: block;
}
#open-envelope:checked ~ .button {
  display: block;
}











.images{
  display:flex;
  gap:12px;
  margin-top:12px;
  opacity:0;

}
.images img{
  width:60px;
  height:60px;
  opacity:0;
  

}

#open-envelope:checked ~ .images {
  opacity: 1;
}

#open-envelope:checked + label .flap {
  transform: rotateX(180deg); 
}