.main {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  height: 100vh;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: end;
  -webkit-align-items: flex-end;
  -ms-flex-align: end;
  align-items: flex-end;
  background-image: url('../images/Intro-Blende-02.jpeg');
  background-position: 50% 50%;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.link-nav {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  margin-top: 50px;
  margin-bottom: 50px;
  padding-top: 10px;
  padding-bottom: 10px;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.5);
}

.link {
  padding: 20px 30px;
  color: #fff;
  font-size: 30px;
  line-height: 30px;
  text-decoration: none;
}

.link:hover {
  font-weight: 700;
}

@media screen and (max-width: 991px) {
  .link {
    text-align: center;
  }
}

@media screen and (max-width: 767px) {
  .main {
    background-position: 50% 50%;
  }

  .link-nav {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    text-align: center;
  }

  .link {
    padding-top: 10px;
    padding-bottom: 10px;
  }
}

@media screen and (max-width: 479px) {
  .main {
    background-position: 50% 50%;
  }

  .link-nav {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
  }

  .link {
    padding-top: 19px;
    padding-bottom: 19px;
    text-align: center;
  }
}