:root{
    --primary: #ffffff;
    --bg-color: rgb(20, 0, 0);
    --bg-envelope-color: #f5edd1;
    --envelope-tab: #ecdeb8;
    --envelope-cover: #e6cfa7;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --txt-color: #444;
    --heart-color: rgb(252, 8, 231);
  }
  body{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .container {
    height: 100vh;
    display: grid;
    place-items: center;
  }
  .container > .envelope-wrapper {
    background: var(--bg-envelope-color);
    box-shadow: 0 0 40px var(--shadow-color);
  }
  .envelope-wrapper > .envelope {
    position: relative;
    width: 300px;
    height: 230px;
  }
  .envelope-wrapper > .envelope::before {
    content: "";
    position: absolute;
    top: 0;
    z-index: 2;
    border-top: 130px solid var(--envelope-tab);
    border-right: 150px solid transparent;
    border-left: 150px solid transparent;
    transform-origin: top;
    transition: all 0.5s ease-in-out 0.7s;
  }
  .envelope-wrapper > .envelope::after {
    content: "";
    position: absolute;
    z-index: 2;
    width: 0px;
    height: 0px;
    border-top: 130px solid transparent;
    border-right: 150px solid var(--envelope-cover);
    border-bottom: 100px solid var(--envelope-cover);
    border-left: 150px solid var(--envelope-cover);
  }
  .envelope > .letter {
    position: absolute;
    right: 20%;
    bottom: 0;
    width: 54%;
    height: 80%;
    background: var(--primary);
    text-align: center;
    transition: all 1s ease-in-out;
    box-shadow: 0 0 5px var(--shadow-color);
    padding: 20px 10px;
  }
  
  .envelope > .letter > .text {
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    color: var(--txt-color);
    text-align: left;
    font-size: 8px;
  }
  .heart {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 15px;
    height: 15px;
    background: var(--heart-color);
    z-index: 4;
    transform: translate(-50%, -20%) rotate(45deg);
    transition: transform 0.5s ease-in-out 1s;
    box-shadow: 0 1px 6px var(--shadow-color);
    cursor: pointer;
    transition: transform 0.5s ease-in-out;
  }
  .heart:before, 
  .heart:after {
    content: "";
    position: absolute;
    width: 15px;
    height: 15px;
    background-color: var(--heart-color);
    border-radius: 50%;
  }
  .heart:before {
    top: -7.5px;
  }
  .heart:after {
    right: 7.5px;
  }
  .flap > .envelope:before {
    transform: rotateX(180deg);
    z-index: 0;
  }
  .flap > .envelope > .letter {
    bottom: 100px;
    transform: scale(1.5);
    transition-delay: 1s;
  }
  .flap > .heart {
    transform: rotate(90deg);
    transition-delay: 0.4s;
  }
  .container > .envelope-wrapper > .developed-by {
    position: absolute;
    bottom: 30px;
    left: 50%; /* Move the text to the center horizontally */
    transform: translateX(-50%);
    /* color: var(--txt-color); */
    color: #fff;
    font-size: px;
    font-weight: lighter;
  }
  .envelope-wrapper > .click-me {
    position: absolute;
    top: 65%; /* Adjust the distance from the top as needed */
    left: 50%; /* Center the text horizontally */
    transform: translateX(-50%); /* Center the text horizontally */
    color: var(--heart-color); /* Match the heart color */
    font-size: 18px;
    font-weight: bold;
    z-index: 3; /* Ensure the text appears above the heart */
  }
  .heart:hover {
    transform: rotate(90deg);
    transition-delay: 0.4s;
  }
  
  .flap > .heart:hover {
    transform: rotate(0deg);
  }