body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background: linear-gradient(to right, #1363df, hsl(216, 100%, 59%));
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

/* HEADER */

.if-navigation {
  text-align: right;
  margin: 3rem;
  font-size: 1.5rem;
}

.if-navigation a {
  text-decoration: none;
  color: white;
  padding: 2rem 3rem;
  display: inline-block;
  transition: 0.3s ease-out;
  background-color: #47b5ff;
  border-radius: 3rem;
  border: 1px solid transparent;
  margin-left: 1rem;
}

.if-navigation a:hover {
  background-color: rgba(19, 101, 223, 0.75);
  border: 1px solid #47b5ff;
  padding: 2rem 3.5rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  width: 200px;
  height: 75px;
  background: url(../img/blue/logo.png) left/contain no-repeat;
  margin-left: 3rem;
}

.Hero-section {
  border: none solid red;
  margin: 30px;
  padding: 1.875rem;
  width: 87.5rem;
  height: 31.25rem;
  color: white;
  /* background-color: rgb(42, 112, 174); */
  border-radius: 0.625rem;
  background-image: url(https://images.unsplash.com/photo-1463717993767-4ded88224b61?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1171&q=80);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  margin-left: 100px;
}

h1 {
  border: none solid #fdeaab;
  /* background-color: rgb(243, 243, 185); */
  border-radius: 5px;
  text-transform: uppercase;
  font-size: 35px;
  float: right;
  color: white;
  padding: 15px;
  margin-top: -10px;
  background: linear-gradient(150deg, yellow, orange, red, pink);
  background-size: 400% 300%;
  animation: BgGradient 12s ease infinite;
}

@keyframes BgGradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
  0% {
    background-position: 0% 50%;
  }
}

.if-background-top {
  position: fixed;
  top: 0;
  width: 100%;
  height: 187px;
  background: url(../img/blue/top-background.png) top / contain no-repeat;
  z-index: -1;
}

.if-background-bottom {
  width: 100%;
  height: 736px;
  position: fixed;
  bottom: 0;
  background: url(../img/blue/bottom-background.png) bottom / contain no-repeat;
  z-index: -1;
}

.container {
  display: inline-block;
  justify-content: center;
  align-items: center;
}

main {
  border: none solid red;
  margin: 1.875rem;
  padding: 1.875rem;
  color: white;
  background-color: aliceblue;
  border-radius: 10px;
  background-image: url("https://images.unsplash.com/photo-1557683316-973673baf926?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1129&q=80");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  width: 1400px;
  margin-left: 100px;
}

h4 {
  color: yellow;
  font-size: 2em;
}
p {
  color: #00fff6;
}

.telefon {
  width: 180px;
  height: 180px;
  border: 3px solid yellow;
  font-size: 0.8em;
  display: inline-block;
  text-transform: capitalize;
  border-radius: 10px;
  margin-left: 20px;
  padding: 5.5px;
}

.monatlich {
  width: 180px;
  height: 180px;
  border: 3px solid yellow;
  font-size: 0.8em;
  display: inline-block;
  text-transform: capitalize;
  margin-left: 20px;
  padding: 5px;
  border-radius: 10px;
}

.gygabites {
  width: 180px;
  height: 180px;
  border: 3px solid yellow;
  font-size: 0.8em;
  display: inline-block;
  text-transform: capitalize;
  margin-left: 20px;
  padding: 5px;
  border-radius: 10px;
}

.roaming {
  width: 180px;
  height: 180px;
  border: 3px solid yellow;
  font-size: 0.8em;
  display: inline-block;
  text-transform: capitalize;
  margin-left: 20px;
  padding: 5px;
  border-radius: 10px;
}

.Zehn-Gig {
  width: 180px;
  height: 180px;
  border: 3px solid rgb(255, 0, 25);
  font-size: 0.8em;
  display: inline-block;
  text-transform: capitalize;
  margin-left: 20px;
  padding: 5px;
  border-radius: 10px;
}
.fünfzehn-Gig {
  width: 180px;
  height: 180px;
  border: 3px solid rgb(255, 0, 25);
  font-size: 0.8em;
  display: inline-block;
  text-transform: capitalize;
  border-radius: 10px;
  margin-left: 20px;
  padding: 5px;
}

.container1 {
  display: flex;
  justify-content: center;
  align-content: center;
}

ul {
  padding: 1px;
  list-style: none;
}

.preise {
  font-size: 2.5em;
}

.test-flex {
  display: flex;
  justify-content: space-evenly;
}
.zu-uns {
  border: 3px solid yellow;
  border-radius: 10px;
  padding: 10px;
  color: wheat;
  text-transform: capitalize;
  font-size: 40px;
}

.Tarifen {
  border: 3px solid red;
  border-radius: 10px;
  padding: 10px;
  color: wheat;
  font-size: 40px;
}

/* -------Flip-Card---------- */

.flip-card {
  background-color: gold;
  perspective: 1000px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  transition-duration: 2s;
}

.flip-card:hover .flip-card-inner {
  transform: rotateY(180deg);
  transition-duration: 2s;
  cursor: pointer;
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.flip-card-front {
  background-color: #bbb;
  color: whitesmoke;
}

.flip-card-back {
  transform: rotateY(180deg);
}

/* ----------------footer----------------- */
/* footer {
    border:none solid red;
    margin: 30px;
    padding: 30px;
    color: white;
    background-color: aliceblue;
    border-radius: 10px;
    background-color: #1363df;
  }
  
   .neue-botton {
    border: none 3px solid red;
    margin: 1em;
    box-shadow: 0px 0px 7px lightskyblue;
  } 
  
  button {
    padding: 1em 2em;
    border-radius: 3em;
    border: none;
    background-color: #47b5ff;
    color: wheat;
    text-transform: capitalize;
    text-decoration: underline;
    font-size: 1em;
  }
  
  button:hover {
    background-color:#abe4e8;
    color: rgb(226, 109, 242);
   
  } */