* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --index: calc(1vw + 1vh);
  --text: #e7e7e0;
  --transition: transform .75s cubic-bezier(.075, .5, 0, 1);
}

@font-face {
  font-family: raleway_f;
  src: url(../fonts/raleway-regular.woff2);
}
@font-face {
  font-family: raleway_f;
  src: url(../fonts/raleway-black.woff2);
  font-weight: 900;
}

body {
  background-color: #010101;
  font-family: raleway_f, sans-serif;
  line-height: 1.55;
}

.main-header {
  position: relative;
}

.button {
  border: none;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius:30px;
  font-family: var(--body-font);
}

.hijau {background-color: #04AA6D;}
.biru {background-color: #008CBA;}

.hijau:hover {
  background-color: #1F6734;
  color: white;
}

.biru:hover {
  background-color: darkblue;
  color: white;
}
.main-header::after {
  position: absolute;
  bottom: calc(var(--index) * -4.5);
  z-index: 100;
  width: 100%;
  height: calc(var(--index) * 10);
  background-image: url(../img/ground.png);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  content: '';
}

.layers {
  position: relative;
  overflow: hidden;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.layer {
  position: absolute;
  z-index: 2;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  will-change: transform;
  transition: var(--transition);
}

.layers__base {
  transform: translate3d(0, calc(var(--scrollTop) / 1.6), 0);
  z-index: 0;
}

.layers__middle {
  transform: translate3d(0, calc(var(--scrollTop) / 2.5), 0);
}
.layers__front {
  transform: translate3d(0, calc(var(--scrollTop) / 5.7), 0);
}

.layers__header {
  z-index: 1;
  transform: translate3d(0, calc(var(--scrollTop) / 2), 0);
  transition: var(--transition);
  will-change: transform;
  color: var(--text);
  font-weight: 900;
  text-transform: uppercase;
  text-shadow: 0 0 15px #9d822b;
}

.layers__title {
  font-size: calc(var(--index) * 2.8);
  letter-spacing: calc(var(--index) / 2.25);
}

.layers__caption {
  margin-top: calc(var(--index) / -.75);
  font-size: calc(var(--index) / 1.175);
  letter-spacing: calc(var(--index) / 3.5);
}

.main-article {
  --main-article-transform: translate3d(0, calc(var(--scrollTop) / -7.5), 0);

  position: relative;
  top: -1px;
	z-index: 10;

  display: inline-block;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100vh;
  color: var(--text);
  background-size: cover;
    background-repeat: no-repeat;
  background-position: center;
}

.main-article__header {
  font-size: calc(var(--index) * 1.8);
  text-transform: uppercase;
  letter-spacing: calc(var(--index) / 7.5);
  transform: var(--main-article-transform);
  transition: var(--transition);
  will-change: transform;
}

.main-article__paragraph {
  max-width: calc(var(--index) * 30);
  margin-top: calc(var(--index) / 1.25);
  font-size: calc(var(--index) * .8);
  transform: var(--main-article-transform);
  transition: var(--transition);
  will-change: transform;
}

.content {
  will-change: transform;
}

.copy {
  position: absolute;
  bottom: calc(var(--index) * 1.6);
  opacity: .45;
  font-size: calc(var(--index) * .75);
  letter-spacing: calc(var(--index) / 37.5);
}