* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  margin: 0;
  background: #313433;
  color: #313433;
}
.page {
  height: 100vh;
}
.page::before {
  content: "";
  width: 300%;
  height: 100%;
  background-color: #B6D6C8;
  position: fixed;
  left: 50%;
  top: 50%;
  z-index: -1;
  transform: translateX(-50%) skew(0, -10deg);
  border-radius: 50%;
  animation: waving 5s ease-in-out infinite alternate;
}
@keyframes waving {
  from {
    transform: translateX(-50%) skew(0, -10deg);
  }
  to {
    transform: translateX(-30%) skew(10deg, 0);
  }
}
.card {
  width: 300px;
  padding: 20px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  background-color: rgba(255, 255, 255, .2);
  backdrop-filter: blur(10px);
  border-radius: 10px;
  box-shadow: 
  1px 1px 10px rgba(255, 255, 255, .2),
  -1px -1px 10px rgba(255, 255, 255, .2);
}
.card img {
  max-width: 100%;
  border-radius: 10px;
}