body {
  margin: 0;
  padding: 0;
}
.hide-scrollbar {
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.hide-scrollbar::-webkit-scrollbar {
  display: none;
}

header {
  margin: 0;
  padding: 0;
  height: 100vh;
  width: 100%;
  background-image: url("Bilder/startbild2.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  justify-content: center;
  align-items: center;
}

header h1 {
  margin-top: 200px;
  font-family: Arial, Helvetica, sans-serif;
  color: rgb(25, 149, 193);
  font-size: 130px;
  /*text-shadow: 0 0 30px rgb(0, 0, 0);*/
}
mark {
  color: rgb(42, 0, 255);
  display: inline-block;
  padding: 10px 40px;
  background-color: rgb(255, 255, 255);
  font-size: 130px;
}

main {
  margin: 0;
  padding: 0;
  background: rgb(240, 240, 240);
}

main h2 {
  padding: 10px;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 130px;
  color: rgb(42, 0, 255);
  text-align: center;
}
#kreiseTitle {
  text-align: center;
  font-size: 80px;
}
.kreis {
  position: relative;
  width: 250px;
  height: 250px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  margin: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  font-family: Arial, Helvetica, sans-serif;
  text-decoration: none;
  border-radius: 5px;
  color: transparent;
  transition: transform 0.5s;
}

.kreis:hover {
  background-color: rgba(0, 0, 0, 0.3);
  background-blend-mode: darken;
  color: rgb(255, 255, 255);
  transform: translateY(-10px) scale(105%) translateX(-2px);
  font-size: 100px;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: bold;
  text-shadow: 0 0 40;
}

.kreis a {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  color: inherit;
}

.kreis1 {
  background-image: url("kreis1/Bilder/Kreis1.png");
}
.kreis2 {
  background-image: url("kreis2/Bilder/Kreis2.png");
}
.kreis3 {
  background-image: url("kreis3/Bilder/Kreis3.png");
}
.kreis4 {
  background-image: url("kreis4/Bilder/Kreis4.png");
}
.kreis5 {
  background-image: url("kreis5/Bilder/Kreis5.png");
}
.kreis6 {
  background-image: url("kreis6/Bilder/Kreis6.png");
}
.kreis7 {
  background-image: url("kreis7/Bilder/Kreis7.png");
}
.kreis8 {
  background-image: url("kreis8/Bilder/Kreis8.png");
}
.kreis9 {
  background-image: url("kreis9/Bilder/Kreis9.png");
}
.kreis10 {
  background-image: url("kreis10/Bilder/Kreis10.png");
}
.kreis11 {
  background-image: url("kreis11/Bilder/kreis11.png");
}
.kreis12 {
  background-image: url("kreis12/Bilder/kreis12.png");
}

.kreis-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 20px;
}
footer {
  display: flex;
  background-color: rgb(197, 197, 197);
  height: 100px;
  margin: 0;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  flex-wrap: wrap;
}
footer h2 {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  text-align: center;
  font-size: 30px;
  padding: 0;
}
footer a {
  text-decoration: none;
  text-align: center;
}
button {
  height: 40px;
  width: 130px;
  border-radius: 20px;
  border: none;
  cursor: pointer;
}

@media (width < 700px) {
  header {
    background-image: url(Bilder/hochformatstartbild.jpg);
    height: 40vh;
  }
  header h1 {
    margin-top: 0px;
    font-family: Arial, Helvetica, sans-serif;
    color: rgb(25, 149, 193);
    font-size: 130px;
    text-shadow: 0 0 30px rgb(0, 0, 0);
    mark {
      color: rgb(42, 0, 255);
      display: inline-block;
      background-color: transparent;
    }
    .kreis {
      width: 100%;
      display: grid;
      grid-template-columns: 1, auto;
    }
  }
  footer {
    display: flex;
    flex-direction: column;
  }
}