* {
  margin: 0;
  padding: 0;
}
body {
  font-family: "Poppins", Verdana, Tahoma, sans-serif;
  background-color: #e8f1f2;
  color: #333;
  margin: 0;
  padding: 0px;
  line-height: 1.6;
  margin: 5% 10%;
  font-size: 1em;
}
h1 {
  color: #e8f1f2;
  text-align: center;
  font-size: 2.5em;
  font-weight: 350;
}
h2 {
  color: #e8f1f2;
  text-align: center;
  font-size: 2em;
  text-shadow: 2px 5px 13px #f02eaa;
  width: 100%;
  text-align: center;
  font-weight: 300;
}
.card-back h2,
.card-back p {
  color: #e8f1f2;
}

nav {
  background-color: rgba(114, 9, 183, 0.75);
  color: #fff;
  padding: 10px 20px;
  text-align: center;
  position: fixed;
  top: 0;
  z-index: 1000;
  border-radius: 0px 0px 55px 0px;
}

#introduction {
  display: block;
  width: 100%;
  text-align: center;
  margin-bottom: 20px;
  position: fixed;
  top: 0;
}
#introduction > p {
  width: 35%;
  position: fixed;
  right: 11%;
  padding: 8px;
  font-size: 0.95em;
  font-style: oblique;
}
main {
  display: flex;
  flex-direction: row;
  margin-top: 10%;
}
article {
  width: 25%;
  height: 600px;
  margin: 0 10px;
  box-shadow: rgba(240, 46, 170, 0.4) -5px 5px,
    rgba(240, 46, 170, 0.3) -10px 10px, rgba(240, 46, 170, 0.2) -15px 15px,
    rgba(240, 46, 170, 0.1) -20px 20px, rgba(240, 46, 170, 0.05) -25px 25px;
}
.card-container {
  margin: 0 auto;
  background-color: #fff;
  overflow: hidden;
  cursor: pointer;
}
div > img {
  width: 100%;
  object-fit: cover;
}
.contribution-image {
  height: 100%;
}
.card-front > h2 {
  position: fixed;
  bottom: 10%;
  background-color: rgba(0, 0, 0, 0.3);
}
.profile-image {
  padding: 0;
  width: 100%;
  object-fit: contain;
  max-height: 500px;
}
.card-back > h2 {
  position: fixed;
  bottom: 45%;
  background-color: rgba(134, 131, 109, 0.3);
}
.bio {
  position: absolute;
  top: 55%;
  background-color: #86836d;
  padding: 15px;
  text-align: left;
  height: 40%;
  overflow-y: scroll;
  overflow-x: hidden;
}
.card {
  width: 100%;
  height: 600px;
  position: relative;
}
.card-back,
.card-front {
  margin: 0;
  width: 100%;
  height: 100%;
  position: absolute;
  justify-content: center;
  align-items: center;
}
.card-front {
  z-index: 2;
  background-color: #ff8e72;
}
.card-back {
  z-index: 1;
  background-color: #86836d;
  overflow: auto;
}
.card-front,
.card-back {
  width: 100%;
  height: 100%;
  position: absolute;
}

/* Card Flip Effect */

.card:hover {
  transform: rotateY(180deg);
}
.card-front {
  backface-visibility: hidden;
}
.card {
  transform-style: preserve-3d;
}
.card-back {
  transform: rotateY(180deg);
}

/* Card Image Zoom Effect */

.card-container:hover .card-back img {
  transform: scale(1.2);
  transition: all 0.6s ease-in-out;
}
footer {
  color: #60463b;
  font-size: 0.7em;
  position: fixed;
  bottom: 0;
  width: 100%;
  z-index: -1;
}

/* Animation for fade-in effect */

@keyframes fadeInUp {
  0% {
    transform: translateY(100%);
    opacity: 0.5;
  }
  100% {
    transform: translateY(0%);
    opacity: 1;
  }
}
.fadeInUp-animation {
  animation: 1.3s fadeInUp;
}

/* Responsive Design */

@media screen and (min-width: 1300px) {
  body {
    overflow: hidden;
  }
}
@media screen and (max-width: 1200px) {
  main {
    margin-top: 15%;
  }
  nav {
    padding: 2px 9px;
  }
  h2 {
    font-size: 1em;
  }
  .card-back > h2 {
   position: absolute;
    top: 250px;
  }
  #introduction {
    display: block;
    top: 10%;
    width: 100%;
    left: 0;
  }
  #introduction > p {
    width: 100%;
    position: relative;
    right: 0%;
    font-size: 0.8em;
  }
  footer {
    font-size: 0.75em;
  }
}
@media screen and (min-width: 1300px) and (max-width: 1343px) {
  main {
    margin-top: 15%;
  }
}
@media screen and (max-width: 1300px) {
  main {
    margin-top: 17%;
  }
}
@media screen and (max-width: 1024px) {
  main {
    display: block;
    margin-top: 8%;
  }
  article {
    width: 100%;
    
    margin: 10px 0 100px 0;
  }
  h1 {
    font-size: 1.5em;
  }
  h2 {
    font-size: 1.6em;
  }
  .card-front h2 {
    font-size: 1.7em;
  }
  .card-back {
    overflow: hidden;
  }
  #introduction {
    position: relative;
  }
  #introduction > p {
    width: 97%;
  }
  .card-back > h2 {
  top: 350px;
  height: 100%;
}
  .bio {
  position: absolute;
  top: 70%;
  background-color: #86836d;
  text-align: left;
  height: 30%;
  }
}
@media screen and (max-width: 500px) {
  h1 {
    font-size: 1em;
  }
  .card-back > h2 {
  top: 220px;
  height: 100%;
  }
  .bio {
  position: absolute;
  top: 50%;
  background-color: #86836d;
  text-align: left;
  height: 50%;
  }
  footer {
    font-size: 0.6em;
  }
}