<div class="message">
  <div><span>Happy holidays!</span></div>
</div>
<div class="tree">
  <div class="part top"><span></span></div>
  <div class="part middle"><span></span></div>
  <div class="part bottom"><span><span></span></span></div>
</div>

@import url("https://fonts.googleapis.com/css2?family=Courgette&display=swap");

:root {
  --tree-color: #345b4d;
}

.tree {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tree::before {
  width: 8vw;
  height: 6vw;
  margin-bottom: -1px;
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  background: var(--tree-color);
  content: "";
  transform: translateY(100%) scale(0);
  animation: pop-in .4s ease-out forwards;
  animation-delay: 1.7s;
}

.tree::after {
  width: 6vw;
  height: 8vw;
  content: "";
  background: rgb(200, 111, 51);
}


/* part styling. */

.part {
  position: relative;
  margin-bottom: -1px;
  background: var(--tree-color);
  transform: translateY(100%) scale(0);
  animation: pop-in .3s ease-out forwards;
}

.top {
  width: 8vw;
  height: 5vw;
  animation-delay: 1.3s;
}

.middle {
  width: 10vw;
  height: 8vw;
  animation-delay: .9s;
}

.bottom {
  width: 15vw;
  height: 13vw;
  animation: scale-in .3s ease-out .5s forwards;
}


.part::before,
.part::after {
  position: absolute;
  width: 100%;
  height: 100%;
  clip-path: polygon(50% 0, 50% 100%, 0 100%);
  transform: translateX(-49%);
  background: var(--tree-color);
  content: "";
}

.part::after {
  clip-path: polygon(50% 0, 100% 100%, 0 500%);
  transform: translateX(49%);
}

.part span,
.part span::before,
.part span::after {
  --top: 200%;
  --left: 400%;
  position: absolute;
  display: block;
  top: 50%;
  left: 50%;
  width: 1vw;
  height: 1vw;
  border-radius: 50%;
  background: hotpink;
  animation: blink 4s ease-in-out infinite;
}

.part span::before,
.part span::after {
  animation-delay: 2s;
  content: "";
  z-index: 2;
}

.part span::before {
  left: calc(var(--left) / -1);
  top: calc(var(--top) / -1);
}

.part span::after {
  left: var(--left);
  top: calc(var(--top) / 2);
}

/* Top specific. */

.top span {
  animation-delay: 2.5s;
}

.top span::before,
.top span::after {
  --top: 150%;
  --left: 300%;
  animation-delay: 3s;
}

/* Bottom specific. */

.bottom span::before,
.bottom span::after {
  --top: 400%;
  --left: 600%;
  animation-delay: 2.8s;
}

.bottom span span {
  background: transparent;
  animation: none;
}

.bottom span span::before {
  --top: 230%;
  --left: 350%;
  animation: blink 4s ease-in-out 6s infinite;
}

.bottom span {
  animation-delay: 0.3s;
}

.bottom span span::after {
  --top: 200%;
  --left: 250%;
  animation: blink 4s ease-in-out 5s infinite;
}

@keyframes blink {
  0%,
  40% {
    background-color: hotpink;
    box-shadow: none;
  }
  10% {
    background-color: #fff;
    box-shadow: 0 0 0.1vw 0.1vw #fff, 0 0 0.3vw 0.3vw hotpink, 0 0 0.5vw 0.5vw #0ff;
  }
}

@keyframes pop-in {
  0% {
    transform: translateY(100%) scale(0);
  }
  1% {
    transform: translateY(100%) scale(1);
  }
  100% {
    transform: translateY(0) scale(1);
  }
}

@keyframes scale-in {
  0% {
    transform: translateY(100%) scale(0);
  }
  1% {
    transform: translateY(0) scale(0);
  }
  100% {
    transform: translateY(0) scale(1);
  }
}

/* General quick styling */

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  justify-content: flex-end;
  padding-top: 30px;
  margin: 0;
  background: linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.1) 50%,
      transparent 50%
    ),
    radial-gradient(rgba(37, 89, 87, 0.2) 90%, transparent 10%), #437c90;
  background-size: 5vw 2vw, 5vw 8vw;
  background-position: 8.75vw 0, -2.5vw -5vw;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

.message {
  display: none;
}

@media screen and (min-width: 786px) {
  .message {
    position: absolute;
    top: 30px;
    right: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 320px;
    height: 200px;
    background: rgb(200, 111, 51);
    border-radius: 17px;
    z-index: -1;
  }

  .message div {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Courgette", cursive;
    position: relative;
    width: 300px;
    height: 180px;
    background: #efd6ac;
    text-align: center;
    font-size: 2.3rem;
    color: #183a37;
    border-radius: 18px;
  }

  .message span {
    transform: rotate(-15deg) skew(-5deg);
  }
}

@media screen and (max-width: 700px) {
  .top {
    width: 20vw;
    height: 15vw;
  }

  .middle {
    width: 25vw;
    height: 20vw;
  }

  .bottom {
    width: 30vw;
    height: 20vw;
  }
  .tree::before {
    width: 20vw;
    height: 14vw;
  }

  .tree::after {
    width: 8vw;
    height: 11vw;
  }

  .part span,
  .part span::before,
  .part span::after {
    width: 2vw;
    height: 2vw;
  }
}