*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
 background: linear-gradient(135deg, rgb(168, 30, 30), rgb(253, 223, 223), red);
 display: flex;
 align-items: center;
 justify-content: center;
 font-family: 'Times New Roman', Times, serif;
}
.body {
 display: flex;
 align-items: center;
 justify-content: center;
 margin-top: 100px;
 flex-direction: column;
 gap: 20px;
}
h2 {
 animation: 1s blink linear infinite;
 display: flex;
 justify-content: center;
}

.birthdayCard {
 position: relative;
 width: 250px;
 height: 490px;
 cursor: pointer;
 transform-style: preserve-3d;
 transition: 1s;
 perspective: 1000px;
}
.cardFront {
 position: absolute;
 background-color: #d8ecfd;
 width: 250px;
 height: 350px;
 overflow: hidden;
 transform-origin: left;
 transition: .6s;
}
.cardFront h2 {
  color: #121035;
  margin-bottom: 15px;
  font-size: 22px;
}
.happy {
 font-family: 'Times New Roman', Times, serif;
 text-align: center;
 font-size: 21px;
 margin: 30px;
 transition: .1s;
}
.image {
  text-align: center; 
  margin-top: 10px; 
} 
.image img {
  max-width: 100%; 
  width: 80%;
  height: auto; 
  border-radius: 50%; 
  border: 5px solid #117568; 
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3); 
}
.cardInside {
 position: absolute;
 background-color: #ffcfcf;
 width: 250px;
 height: 350px;
 z-index: -1;
 left: 0;
 top: 0;
 box-shadow: inset 100px 20px 100px rgba(0, 0, 0, 0.2);
}
p {
 font-family: 'Times New Roman', Times, serif;
 margin: 3px 10px 10px 30px;
 color: #333;
 text-align: justify;
}
.name {
 position: absolute;
 left: 150px;
 color: #333;
 text-decoration: underline;
}
.back {
 font-family: 'Times New Roman', Times, serif;
 color: #333;
 text-align: start;
 margin: 30px;
 font-size: 12px;
}
#playButton {
  display: block;
  margin: 0 auto;
  padding: 10px 20px;
  background-color: #3498db; 
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
}
#playButton:hover {
  background-color: #2980b9; 
}
.birthdayCard:hover {
 transform: perspective(2500px) rotate(5deg);
 box-shadow: inset 100px 20px 100px rgba(0, 0, 0, .2), 0 10px 100px rgba(0, 0, 0, 0.5);
}
.birthdayCard:hover .cardFront {
 transform: rotateY(-160deg);
}
.birthdayCard:hover .happy {
 visibility: hidden;
}

@keyframes blink {
 0% {
  color: white;
 }

 20% {
  color: rgb(36, 203, 245);
 }

 40% {
  color: rgb(164, 19, 231);
 }

 60% {
  color: red;
 }

 80% {
  color: rgb(65, 26, 45);
 }

 100% {
  color: blue;
 }
} 
footer{
 font-size: 10px;
 color: white;
 position: absolute;
 bottom: 0px;
}
footer a{
 color: white;
}