website/index.css

:root {
  --background: rgb(255, 255, 230);
  --background-header: rgb(250, 220, 120);
  --background-nav: rgb(252.5, 237.5, 175);
  --text: rgb(50, 50, 50);
  --sphere: rgb(245, 180, 100);
  --hill: rgb(50, 235, 150);
  --hillshade: rgb(40, 160, 100);
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: rgb(0, 45, 60);
    --background-header: rgb(0, 70, 100);
    --background-nav: rgb(0, 62.5, 80);
    --text: rgb(255, 255, 255);
    --sphere: rgb(105, 210, 255);
    --hill: rgb(0, 95, 135);
    --hillshade: rgb(0, 45, 60);
  }
}

* {
  box-sizing: border-box;
  scrollbar-color: var(--sphere) var(--background-header);
}

html {
  scroll-behavior: smooth;
}

a {
  color: var(--text);
  text-underline-offset: 3px;
  transition: text-decoration-color .15s ease;
}

a:hover {
  text-decoration-color: var(--sphere);
}

body {
  background: var(--background);
  color: var(--text);
  font-family: 'Lucida Console', 'Courier New', monospace;
  hyphens: auto;
  line-height: 1.8;
  margin: 0;
}

header {
  background: var(--background-header);
  color: var(--text);
  display: flex;
  flex-direction: column;
  height: 40vh;
  justify-content: center;
  overflow: hidden;
  position: relative;
  text-align: center;
}

header h1 {
  font-size: 3.6em;
  line-height: .9em;
  margin: 0;
  z-index: 10;
}

header p {
  margin: 0;
  z-index: 10;
}

header #sphere {
  background: var(--sphere);
  border-radius: 100%;
  display: none;
  height: 10vh;
  left: 30vw;
  position: absolute;
  top: 3vh;
  width: 10vh;
}

header #hill {
  background: var(--hill);
  border-radius: 40px;
  bottom: 0;
  display: none;
  height: 40vh;
  left: 50vw;
  position: absolute;
  transform: rotate(45deg) translate(50%, 50%);
  width: 40vh;
}

header #hillshade {
  background: var(--hillshade);
  border-radius: 80px;
  bottom: -5vh;
  display: none;
  height: 40vh;
  left: 30vw;
  position: absolute;
  transform: rotate(45deg) translate(50%, 50%);
  width: 40vh;
}

#header-background {
  height: 100%;
  position: absolute;
  align-self: center;
}

main {
  margin: 0 auto;
  max-width: 1200px;
}

main > nav {
  align-items: center;
  background: var(--background-nav);
  border-radius: 10px;
  display: flex;
  gap: 20px;
  height: 60px;
  justify-content: center;
  margin: 0px 20px -30px 20px;
  position: relative;
  top: -30px;
}

main section {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 20px;
  margin: 40px 20px;
}

main article {
  background: var(--background-header);
  border-radius: 10px;
  box-shadow: rgba(0, 0, 0, 0.1) 10px 10px 0px 0px;
  display: flex;
  flex-direction: column;
  padding: 40px;
  transition: box-shadow .3s ease, transform .3s ease;
}

main article:hover {
  box-shadow: rgba(0, 0, 0, 0.1) 10px 15px 0px 0px;
  transform: translate(0, -5px);
}

main article a {
  background: var(--background);
  border-radius: 5px;
  box-shadow: rgba(0, 0, 0, 0.1) 5px 5px 0px 0px;
  color: var(--text);
  display: inline-block;
  font-weight: bold;
  padding: 10px 14px;
  text-decoration: none;
  transition: box-shadow .15s ease, transform .15s ease;
}

main article a:hover {
  box-shadow: rgba(0, 0, 0, 0.1) 2.5px 2.5px 0px 0px;
  transform: translate(2.5px, 2.5px);
}

main article a:active {
  box-shadow: rgba(0, 0, 0, 0.1) 0px 0px 0px 0px;
  transform: translate(5px, 5px);
}

main article h2 {
  font-size: 1.8em;
  line-height: normal;
  margin: 0;
}

main article p {
  margin: 20px 0;
}

main article nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  hyphens: none;
  margin-top: auto;
}

@media (max-width: 1000px) {
  header hill {
    transform: rotate(45deg) translate(40%, 70%);
  }
  header hillshade {
    transform: rotate(45deg) translate(20%, 80%);
  }
  section#dienste {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  section#dienste {
    grid-template-columns: repeat(1, 1fr);
  }
}

@media (prefers-color-scheme: dark) {
  header #sphere {
    left: unset;
    right: 30vw;
  }
}