/* author: Kass
https://codepen.io/kassandrasanch/pen/PoxZoXP */

body {
  overflow: hidden;
}
.container {
  font-family: "Inter", sans-serif;
  font-weight: 800;
  width: 100vw;
  height: 100vh;
  background: #f3f3f3;
  position: relative;
}
.container .card-box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.container .card {
  border-radius: 0px;
  border-radius: 0px;
  background: #ffffff;
  box-shadow: inset 20px 20px 60px #d9d9d9, inset -20px -20px 60px #ffffff;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 90vw;
  height: 90vh;
  border: 1px solid rgba(0, 0, 0, 0.15);
}
.container .card:before {
  content: "";
  width: 450px;
  height: 300px;
  width: 90vw;
  height: 90vh;
  left: 2px;
  z-index: -1;
  position: absolute;
  box-shadow: 1px 1px 0px #f3f3f3, 2px 2px 0px #f3f3f3, 3px 3px 0px #f3f3f3, 4px 4px 0px #f3f3f3, 5px 5px 0px #f3f3f3,
    6px 6px 0px #f3f3f3;
}
.container .card .inner {
  width: 430px;
  height: 280px;
  width: 88vw;
  height: 87vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(146deg, #ece9e6, #ffffff, #ffedbc, #78fcfa, pink, gold);
  background-size: 600% 600%;
  -webkit-animation: bk 15s ease infinite;
  -moz-animation: bk 15s ease infinite;
  animation: bk 20s ease infinite;
}
.container .card .center {
  width: 415px;
  height: 265px;
  width: 97%;
  height: 95%;
  border-radius: 0px;
  background: transparent;
  box-shadow: inset 20px 20px 60px #d9d9d9, inset -20px -20px 60px #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
}
.container .card .center h1 {
  font-size: 6rem;
  font-size: 80px;
  font-weight: 800;
  letter-spacing: -3px;
  color: transparent;
  color: rgba(35, 35, 35, 0.8);
  mix-blend-mode: hard-light;
}

@-webkit-keyframes bk {
  0% {
    background-position: 18% 0%;
  }
  50% {
    background-position: 83% 100%;
  }
  100% {
    background-position: 18% 0%;
  }
}
@-moz-keyframes bk {
  0% {
    background-position: 18% 0%;
  }
  50% {
    background-position: 83% 100%;
  }
  100% {
    background-position: 18% 0%;
  }
}
@keyframes bk {
  0% {
    background-position: 18% 0%;
  }
  50% {
    background-position: 83% 100%;
  }
  100% {
    background-position: 18% 0%;
  }
}