JSFiddle - React, Tailwind, and code Playground

HTML

<div class="locationContainer">
  <div class="flex cntr">
  </div>
  <div class="locationDropdown" role="listbox">
    <div class="dropdownLeft">
      <div class="voivodeshipContainer">
        <li role="option" class="listItem">Cała Polska</li>
        <div class="citiesContainer"></div>
      </div>
      <div class="rel voivodeshipContainer">
        <li role="option" class="inblock listItem">Dolnośląskie</li>
        <div class="citiesContainer">
          <li role="option" class="inblock listItem">Wrocław</li>
          <li role="option" class="inblock listItem">Wałbrzych</li>
        </div>
      </div>
      <div class="rel voivodeshipContainer">
        <li role="option" class="inblock listItem">Lubelskie</li>
        <div class="citiesContainer">
          <li role="option" class="inblock listItem">Lublin</li>
          <li role="option" class="inblock listItem">Puławy</li>
        </div>
      </div>
      <div class="rel voivodeshipContainer">
        <li role="option" class="inblock listItem">Lubuskie</li>
        <div class="citiesContainer">
          <li role="option" class="inblock listItem">Zielona Góra</li>
          <li role="option" class="inblock listItem">Opoczno</li>
        </div>
      </div>
      <div class="rel voivodeshipContainer">
        <li role="option" class="inblock listItem">Łódzkie</li>
        <div class="citiesContainer">
          <li role="option" class="inblock listItem">Łódź</li>
          <li role="option" class="inblock listItem">Radomsko</li>
        </div>
      </div>
      <div class="rel voivodeshipContainer">
        <li role="option" class="inblock listItem">Małopolskie</li>
        <div class="citiesContainer">
          <li role="option" class="inblock listItem">Kraków</li>
          <li role="option" class="inblock listItem">Tarnów</li>
        </div>
      </div>
      <div class="rel voivodeshipContainer">
        <li role="option" class="inblock listItem">Mazowieckie</li>
        <div...

CSS

ul, li {
  list-style: none;
}

body {
  background-color: grey;
}

.locationContainer {
  background-color: white;
}

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

.listItem {
  color: #002f34;
  padding: 8px 17px;
  width: 80%;
}

.listItem:hover {
  color: white!important;
  background-color: #002f34;
}

.locationField {
  height: 56px;
  padding: 8px 0;
  border: none;
  color: #002f34;
  margin-right: auto;
}

.locationDropdown {
  position: absolute;
  width: 250px;
  border: 1px solid #f2f4f5;
  top: 72px;
  z-index: 5;
  animation: droplist 0.25s ease-in;
}


.dropdownLeft {
  max-height: 300px;
  overflow: auto;
   padding-right: 250px;
  margin-right: -250px;
}

.dropdownLeft::-webkit-scrollbar {
  display: none;
}

.voivodeshipContainer {
  background-color: white;
  width: 200px;
  position: relative;
}

.voivodeshipContainer:hover .citiesContainer {
  display: block !important;
}

.voivodeshipContainer .citiesContainer {
  display: none;
}


.voivodeshipContainer:hover {
  background-color: #002f34;
}

.voivodeshipContainer:hover .listItem {
  color: white;
}


.voivodeshipContainer:hover .citiesContainer  .listItem {
  color: #002f34;
}

.citiesContainer {
  position: absolute;
  width: 300px;
  right: -300px;
  background-color: white;
  bottom: -17px;
}