.dropdown-wrapper {
  position: relative;
  z-index: 2;
  margin-bottom: 20px;
}
@media only screen and (min-width: 1100px) {
  .dropdown-wrapper {
    margin-bottom: 5.625rem;
  }
}
.dropdown-wrapper .dropdown-btn {
  padding: 14px 25px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid #1a1a1a;
  width: 31.25rem;
  min-width: 260px;
  position: relative;
  border-radius: 5px;
}
.dropdown-wrapper .dropdown-btn::after {
  content: "";
  position: absolute;
  background-image: url(../../img/pfeil-down.svg);
  width: 20px;
  height: 12px;
  right: 20px;
  top: calc(50% - 6px);
  background-repeat: no-repeat;
}
@media only screen and (max-width: 699px) {
  .dropdown-wrapper .dropdown-btn {
    width: 100%;
  }
}
.dropdown-wrapper .dropdown-content {
  list-style: none;
  margin: 0;
  padding: 0;
  background-color: white;
  border: 1px solid #1a1a1a;
  width: 100%;
  position: absolute;
  z-index: 2;
  height: 0;
  display: none;
  transition: 0.1s;
  border-bottom-left-radius: 5px;
  border-bottom-right-radius: 5px;
  margin-top: -2px;
}
.dropdown-wrapper .dropdown-content a {
  text-decoration: none;
}
@media only screen and (max-width: 699px) {
  .dropdown-wrapper .dropdown-content {
    width: 100%;
  }
}
.dropdown-wrapper .dropdown-content ul {
  margin: 0;
  padding: 0;
}
.dropdown-wrapper .dropdown-content .second-level-list {
  padding-left: 20px;
}
.dropdown-wrapper .dropdown-content li {
  margin: 0 10px 10px 10px;
  display: block;
}
.dropdown-wrapper .dropdown-content li a {
  display: block;
  color: #1a1a1a;
  position: relative;
  padding-left: 40px;
}
.dropdown-wrapper .dropdown-content li a::after {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 24px;
  height: 24px;
  border: 1px solid #1a1a1a;
  border-radius: 3px;
}
@media only screen and (max-width: 1099px) {
  .dropdown-wrapper .dropdown-content li a::after {
    top: 3px;
  }
}
@media only screen and (max-width: 699px) {
  .dropdown-wrapper .dropdown-content li a::after {
    top: 0;
  }
}
.dropdown-wrapper .dropdown-content li a.active:after {
  background: url(../../img/check.png) no-repeat center;
}
.dropdown-wrapper.open .dropdown-content {
  height: auto;
  padding: 12px 0;
}
.dropdown-wrapper.open .dropdown-btn:after {
  transform: rotate(180deg);
}

@media only screen and (min-width: 1100px) {
  .categories-filter-wrapper {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .categories-filter-wrapper .all {
    grid-column: 1/-1;
  }
}

@media only screen and (max-width: 1099px) {
  #posts-content {
    padding-left: 40px;
    padding-right: 40px;
  }
}
@media only screen and (max-width: 699px) {
  #posts-content {
    padding-left: 20px;
    padding-right: 20px;
  }
}
@media only screen and (min-width: 1100px) {
  #posts-content {
    padding-left: 7.5rem;
    padding-right: 7.5rem;
  }
}

.references-wrapper {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px;
  position: relative;
}
@media only screen and (max-width: 1099px) {
  .references-wrapper {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media only screen and (max-width: 699px) {
  .references-wrapper {
    grid-template-columns: repeat(1, 1fr);
  }
}
.references-wrapper .reference img {
  display: block;
  width: 100%;
  margin-bottom: 20px;
}
.references-wrapper .reference a {
  color: #1a1a1a;
}