html {
  scroll-behavior: smooth;
}
section {
  height: 100vh;
  position: relative;
}

a#scroll-btn {
  position: absolute;
  height: 2.5em;
  width: 1.55em;
  border: 0.25em solid #ffffff;
  margin: auto;
  left: 0;
  right: 0;
  bottom: 6.25em;
  border-radius: 3em;
}
a#scroll-btn:before {
  position: absolute;
  content: "";
  margin: auto;
  left: 0;
  right: 0;
  top: 1.2em;
  height: 1.2em;
  width: 1.2em;
  background-color: #ffffff;
  border-radius: 50%;
  animation: move-down 2s infinite;
}
@keyframes move-down {
  80% {
    opacity: 0.5;
  }
  100% {
    transform: translateY(2.6em);
    opacity: 0;
  }
}
a#scroll-btn:after {
  position: absolute;
  content: "SCROLL DOWN";
  width: 12em;
  display: block;
  width: 12em;
  text-align: center;
  left: -4.2em;
  bottom: -2.5em;
  font-size: 0.8em;
  color: #ffffff;
  letter-spacing: 3px;
  font-weight: 600;
}
@media screen and (max-width: 500px) {
  a#scroll-btn {
    font-size: 12px;
  }
}