* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background-color: black;
  height: auto;
  width: 100%;
  overflow-x: hidden;
}

.in,
main,
header,
footer {
  position: relative;
  z-index: 1;
}

.starry_sky {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: linear-gradient(
    to bottom,
    #1b0f2e 0%,
    #3b216e 40%,
    #4a276d 70%,
    #6e5483 100%
  );
  z-index: 0;
  pointer-events: none;
}

.constellation {
  position: absolute;
  width: 100%;
  height: 100%;
}

.star {
  position: absolute;
  border-radius: 50%;
  background-color: white;
  animation-name: moveUp;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.star.style1 {
  animation-duration: 40s;
}
.star.style2 {
  animation-duration: 50s;
}
.star.style3 {
  animation-duration: 60s;
}
.star.style4 {
  animation-duration: 70s;
}

.star.tam1 {
  width: 1px;
  height: 1px;
}
.star.tam2 {
  width: 2px;
  height: 2px;
}
.star.tam3 {
  width: 3px;
  height: 3px;
}

.star.opacity1 {
  opacity: 1;
}
.star.opacity2 {
  opacity: 0.5;
}
.star.opacity3 {
  opacity: 0.2;
}

@keyframes moveUp {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(-100vh);
  }
}