.post-filter {
  font-family: "Arial", sans-serif;
  position: relative;
  display: flex;
  justify-content: flex-end;
}

.drop-down-button {
  padding: 10px 18px;
  background: none;
  border: none;
    cursor: pointer;
  font-size: 20px;
  text-decoration: underline;
}

.drop-down-button:hover {
  background: #f5f5f5;
}

.drop-down-menu {
  position: absolute;
  top: 100%;
  right: 0;
  width: 220px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  margin: 8px 0 0 0;
  padding: 0;
  list-style: none;
  box-shadow: 0px 4px 12px rgba(0,0,0,0.2);
  display: none;
  z-index: 999;
}

.drop-down-menu li {
  padding: 10px 14px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.drop-down-menu li:hover {
  background: #f0f0f0;
}

.drop-down-menu.show {
  display: block;
}