style.css

.love-wrapper {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.rectangle-wrapper {
  position: relative;
  display: block;
  margin-top: -20vh;
}
.rectangle {
  position: relative;
  width: 320px;
  height: 180px;
}
.rectangle::before {
  position: absolute;
  content: "";
  top: 0;
  z-index: 1;
  border-top: 80px solid #d3eafd;
  border-left: 160px solid transparent;
  border-right: 160px solid transparent;
  transform-origin: top;
  transition: all 0.5s ease-in-out 0.5s;
}
.animation .rectangle::before {
  transform: rotateX(180deg);
}
.rectangle::after {
  position: absolute;
  content: "";
  top: 0;
  border-top: 80px solid transparent;
  border-left: 160px solid #b4d2ee;
  border-right: 160px solid #b4d2ee;
  border-bottom: 100px solid #b4d2ee;
  z-index: 5;
}
.card {
  position: absolute;
  bottom: 0;
  margin: 0 auto;
  width: 60%;
  height: 90%;
  left: 0;
  right: 0;
  transition: all 1s ease-in-out;
  background: #fff;
  z-index: -1;
  box-shadow: 0 0 5px rgb(0 0 0 / 20%);
}
.card .close {
  position: absolute;
  top: 3px;
  right: 5px;
  transform: rotate(45deg);
  line-height: 1em;
  font-weight: 1000;
  font-size: 16px;
  cursor: pointer;
}
.card div {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 24px;
  padding: 0 16px;
  flex-direction: column;
}
.card div p {
  margin: 0;
  font-size: 12px;
  line-height: 24px;
}
.card > div > p:first-child {
  align-self: flex-start;
}
.animation .card {
  bottom: 100px;
  transform: scale(1.5);
  transition-delay: 0.8s;
  z-index: 4;
}

.rectangle-love {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  background: #c51803;
  transform: translate(-50%, -100%) rotate(45deg);
  box-shadow: 0 1px 6px rgb(0 0 0 / 60%);
  cursor: pointer;
  transition: transform 0.5s ease-in-out 0.7s;
  z-index: 10;
}
.animation .rectangle-love {
  transform: rotate(90deg) translate(-50%);
  transition-delay: 0.4s;
}
.rectangle-love::before {
  position: absolute;
  content: "";
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #c51803;
  top: -12px;
}
.rectangle-love::after {
  position: absolute;
  content: "";
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #c51803;
  left: -12px;
  top: 0px;
}