.hero {
  background: url(../img/back.webp) no-repeat center;
  background-size: cover;
  height: 110vh;
  width: 100%;
  position: relative;
  display: flex;
  justify-content: center;
  top: -66px;
  color: #ffffff;
  font-weight: 500;
  font-size: 4vh;
  transition: all 0.3s ease-in-out;
}
.hero.is_open {
  filter: brightness(0.5);
  transition: all 0.3s ease-in-out;
}

.hero_left {
  color: white;
  width: 40%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  float: left;
  text-align: justify;
  margin-top: 15vh;
}
.hero_left p {
  text-shadow: black 0.2em 0.2em 0.4em;
}
.hero_left .rej {
  height: 30px;
}
.hero_left .glow-on-hover:before {
  height: 34px;
}
.hero_right {
  color: white;
  width: 40%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  float: right;
  margin-top: 15vh;
}
.s1 {
  height: 110vh;
  width: 100%;
  margin-top: -80px;
}
.s2 {
  height: 110vh;
  width: 100%;
}
.s3 {
  backgroung: #000000;
  height: 110vh;
  width: 100%;
}
.liere {
  height: 110vh;
  width: 100%;
  margin-left: -20%;
  margin-right: -20%;
  position: absolute;
}
.liere {
  background: url("../img/liere.png") no-repeat center center;
  background-size: cover;
}


.wrapper, .card-front, .card-back {
  width: 36vh;
  height: 48vh;
}
.wrapper {
  margin: 1em auto;
  perspective: 1000px;
}
.wrapper:hover .flipper, .flip-container.hover .flipper {
  transform: rotateY(180deg);
}
.flipper {
  position: relative;
  transition: 0.8s;
  transform-style: preserve-3d;
}
.card-front, .card-back {
  position: absolute;
  top: 0;
  left: 0;
  padding: 20px;
  backface-visibility: hidden;
  text-align: center;
  box-sizing: border-box;
}
.card-front {
  z-index: 2;
  background: url(../img/ac1.png) no-repeat center center;
  background-size: cover;
}
.card-back {
  transform: rotateY(180deg);
  background: url(../img/ac2.png) no-repeat center center;
  background-size: cover;
}

@-webkit-keyframes bounce {
  0%   { margin-top: 15px; margin-bottom: 10px; }
  50%  { margin-top: 22px; margin-bottom: 3px; }
  100% { margin-top: 15px; margin-bottom: 10px; }
}
@keyframes bounce {
  0%   { margin-top: 15px; margin-bottom: 10px; }
  50%  { margin-top: 22px; margin-bottom: 3px; }
  100% { margin-top: 15px; margin-bottom: 10px; }
}
@-webkit-keyframes shadow {
  0%   { padding: 1px; opacity: 0.10; }
  50%  { padding: 3px; opacity: 0.18; }
  100% { padding: 1px; opacity: 0.10; }
}
@keyframes shadow {
  0%   { padding: 1px; opacity: 0.10; }
  50%  { padding: 3px; opacity: 0.18; }
  100% { padding: 1px; opacity: 0.10; }
}

@media only screen and (max-width: 1500px) {
  .hero {
    font-size: 3vh;
  }
}

@media only screen and (max-width: 1170px) {
  .hero {
    top: 0;
    font-size: 20px;
    margin-top: -10vh;
  }
  .hero_left {
    width: 100%;
    height: 50%;
    float: none;
    margin-top: 15vh;
  }
  .hero_right {
    margin-top: 20vh;
    width: 100%;
    height: 50%;
    float: none;
    display: none;
  }
  .hero_left .glow-on-hover:before {
    display: block;
  }
  .hero_left .glow-on-hover:after {
    display: block;
  }
  .liere {
    display: none;
  }
}