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HTML

              
                <div class="dropdown-container">
  <button class="dropdown-button main-button">
    <span class="dropdown-title-icon">
      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
        <path d="M16 8.049c0-4.446-3.582-8.05-8-8.05C3.58 0-.002 3.603-.002 8.05c0 4.017 2.926 7.347 6.75 7.951v-5.625h-2.03V8.05H6.75V6.275c0-2.017 1.195-3.131 3.022-3.131.876 0 1.791.157 1.791.157v1.98h-1.009c-.993 0-1.303.621-1.303 1.258v1.51h2.218l-.354 2.326H9.25V16c3.824-.604 6.75-3.934 6.75-7.951z" />
      </svg>
    </span>
    <span class="dropdown-title text-truncate">Facebook</span>
    <span class="dropdown-arrow">
      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
        <path d="M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z" />
      </svg>
    </span>
  </button>
  <div class="dropdown-list-container">
    <div class="dropdown-list-wrapper">
      <ul class="dropdown-list"></ul>
      <div class="floating-icon" aria-hidden="true"></div>
    </div>
  </div>
</div>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css2?family=Roboto&display=swap");

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-color: #222429;
  --primary-bg-color: #333740;
  --primary-color: #2c62f6;
  --text-color: #b1b8ca;
  --text-active: #ffffff;
  --button-hover-bg-color: #2b2e34;
  --border-color: #494d59;
  --dropdown-height: 0;
  --rotate-arrow: 0;
  --translate-value: 0;
  --list-opacity: 0;
  --transition-time: 0.4s;
  --transition-timing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --border-radius: 1.4rem;
  --list-button-height: 4.6rem;
  --floating-icon-size: 26;
  --floating-icon-top: 0;
  --floating-icon-left: 0;
}

html {
  font-size: 62.5%;
}

html,
body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--bg-color);
  padding: 1.5rem;
  line-height: 1.4;
}

button {
  border: none;
  cursor: pointer;
  background-color: transparent;
  outline: none;
}

svg {
  height: 1.6rem;
  width: 1.6rem;
}

.text-truncate {
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.dropdown-container {
  margin-top: 30vh;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 34rem;
}

.dropdown-title-icon,
.dropdown-arrow {
  display: inline-flex;
}

.dropdown-title {
  margin: 0 auto 0 1.8rem;
  text-transform: capitalize;
}

.dropdown-button {
  font-family: "Roboto", sans-serif;
  font-weight: 400;
  font-size: 1.7rem;
  display: flex;
  align-items: center;
  padding: 0 1.8rem;
}

.dropdown-button svg {
  transition: all var(--transition-time) var(--transition-timing);
  fill: var(--text-color);
}

.dropdown-button svg,
.dropdown-button span {
  pointer-events: none;
}

.dropdown-button:hover,
.dropdown-button:focus {
  color: var(--text-active);
}

.dropdown-button:hover svg,
.dropdown-button:focus svg {
  fill: var(--text-active);
}

.main-button {
  height: 5.2rem;
  border-radius: var(--border-radius);
  color: var(--text-color);
  background-color: var(--primary-bg-color);
  border: 0.1rem solid var(--border-color);
  transition: all var(--transition-time) var(--transition-timing);
}

.main-button:focus {
  border: 0.1rem solid var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(44, 98, 246, 0.4);
}

.main-button .dropdown-arrow {
  transition: transform var(--transition-time) var(--transition-timing);
  transform: rotate(var(--rotate-arrow));
  margin-left: 1.8rem;
}

.list-button {
  height: var(--list-button-height);
  transition: color var(--transition-time) var(--transition-timing);
  color: var(--text-color);
  overflow: hidden;
  cursor: none;
}

.dropdown-list-container {
  overflow: hidden;
  max-height: var(--dropdown-height);
  transition: max-height var(--transition-time) var(--transition-timing);
}

.dropdown-list-wrapper {
  margin-top: 1rem;
  padding: 1rem;
  background-color: var(--primary-bg-color);
  border-radius: var(--border-radius);
  border: 0.1rem solid var(--border-color);
  position: relative;
}

ul.dropdown-list {
  position: relative;
  list-style-type: none;
}

ul.dropdown-list::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  z-index: 0;
  opacity: 0;
  height: var(--list-button-height);
  background-color: var(--button-hover-bg-color);
  transition: all var(--transition-time) linear;
  transform: translateY(var(--translate-value));
  border-radius: var(--border-radius);
  pointer-events: none;
}
ul.dropdown-list:hover::before,
ul.dropdown-list:hover ~ .floating-icon {
  opacity: 1;
}

li.dropdown-list-item {
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
  opacity: var(--list-opacity);
  transition: opacity 0.8s var(--transition-timing);
}

.floating-icon {
  height: calc(var(--floating-icon-size) * 1px);
  width: calc(var(--floating-icon-size) * 1px);
  position: absolute;
  top: var(--floating-icon-top);
  left: var(--floating-icon-left);
  background-color: var(--border-color);
  border-radius: 1rem;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-time) var(--transition-timing);
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.floating-icon svg {
  fill: var(--text-active);
}

              
            
!

JS

              
                const root = document.documentElement;
const dropdownTitleIcon = document.querySelector(".dropdown-title-icon");
const dropdownTitle = document.querySelector(".dropdown-title");
const dropdownList = document.querySelector(".dropdown-list");
const mainButton = document.querySelector(".main-button");
const floatingIcon = document.querySelector(".floating-icon");

const icons = {
  linkedin:
    "M0 1.146C0 .513.526 0 1.175 0h13.65C15.474 0 16 .513 16 1.146v13.708c0 .633-.526 1.146-1.175 1.146H1.175C.526 16 0 15.487 0 14.854V1.146zm4.943 12.248V6.169H2.542v7.225h2.401zm-1.2-8.212c.837 0 1.358-.554 1.358-1.248-.015-.709-.52-1.248-1.342-1.248-.822 0-1.359.54-1.359 1.248 0 .694.521 1.248 1.327 1.248h.016zm4.908 8.212V9.359c0-.216.016-.432.08-.586.173-.431.568-.878 1.232-.878.869 0 1.216.662 1.216 1.634v3.865h2.401V9.25c0-2.22-1.184-3.252-2.764-3.252-1.274 0-1.845.7-2.165 1.193v.025h-.016a5.54 5.54 0 0 1 .016-.025V6.169h-2.4c.03.678 0 7.225 0 7.225h2.4z",
  instagram:
    "M8 0C5.829 0 5.556.01 4.703.048 3.85.088 3.269.222 2.76.42a3.917 3.917 0 0 0-1.417.923A3.927 3.927 0 0 0 .42 2.76C.222 3.268.087 3.85.048 4.7.01 5.555 0 5.827 0 8.001c0 2.172.01 2.444.048 3.297.04.852.174 1.433.372 1.942.205.526.478.972.923 1.417.444.445.89.719 1.416.923.51.198 1.09.333 1.942.372C5.555 15.99 5.827 16 8 16s2.444-.01 3.298-.048c.851-.04 1.434-.174 1.943-.372a3.916 3.916 0 0 0 1.416-.923c.445-.445.718-.891.923-1.417.197-.509.332-1.09.372-1.942C15.99 10.445 16 10.173 16 8s-.01-2.445-.048-3.299c-.04-.851-.175-1.433-.372-1.941a3.926 3.926 0 0 0-.923-1.417A3.911 3.911 0 0 0 13.24.42c-.51-.198-1.092-.333-1.943-.372C10.443.01 10.172 0 7.998 0h.003zm-.717 1.442h.718c2.136 0 2.389.007 3.232.046.78.035 1.204.166 1.486.275.373.145.64.319.92.599.28.28.453.546.598.92.11.281.24.705.275 1.485.039.843.047 1.096.047 3.231s-.008 2.389-.047 3.232c-.035.78-.166 1.203-.275 1.485a2.47 2.47 0 0 1-.599.919c-.28.28-.546.453-.92.598-.28.11-.704.24-1.485.276-.843.038-1.096.047-3.232.047s-2.39-.009-3.233-.047c-.78-.036-1.203-.166-1.485-.276a2.478 2.478 0 0 1-.92-.598 2.48 2.48 0 0 1-.6-.92c-.109-.281-.24-.705-.275-1.485-.038-.843-.046-1.096-.046-3.233 0-2.136.008-2.388.046-3.231.036-.78.166-1.204.276-1.486.145-.373.319-.64.599-.92.28-.28.546-.453.92-.598.282-.11.705-.24 1.485-.276.738-.034 1.024-.044 2.515-.045v.002zm4.988 1.328a.96.96 0 1 0 0 1.92.96.96 0 0 0 0-1.92zm-4.27 1.122a4.109 4.109 0 1 0 0 8.217 4.109 4.109 0 0 0 0-8.217zm0 1.441a2.667 2.667 0 1 1 0 5.334 2.667 2.667 0 0 1 0-5.334z",
  facebook:
    "M16 8.049c0-4.446-3.582-8.05-8-8.05C3.58 0-.002 3.603-.002 8.05c0 4.017 2.926 7.347 6.75 7.951v-5.625h-2.03V8.05H6.75V6.275c0-2.017 1.195-3.131 3.022-3.131.876 0 1.791.157 1.791.157v1.98h-1.009c-.993 0-1.303.621-1.303 1.258v1.51h2.218l-.354 2.326H9.25V16c3.824-.604 6.75-3.934 6.75-7.951z",
  twitter:
    "M5.026 15c6.038 0 9.341-5.003 9.341-9.334 0-.14 0-.282-.006-.422A6.685 6.685 0 0 0 16 3.542a6.658 6.658 0 0 1-1.889.518 3.301 3.301 0 0 0 1.447-1.817 6.533 6.533 0 0 1-2.087.793A3.286 3.286 0 0 0 7.875 6.03a9.325 9.325 0 0 1-6.767-3.429 3.289 3.289 0 0 0 1.018 4.382A3.323 3.323 0 0 1 .64 6.575v.045a3.288 3.288 0 0 0 2.632 3.218 3.203 3.203 0 0 1-.865.115 3.23 3.23 0 0 1-.614-.057 3.283 3.283 0 0 0 3.067 2.277A6.588 6.588 0 0 1 .78 13.58a6.32 6.32 0 0 1-.78-.045A9.344 9.344 0 0 0 5.026 15z",
  youtube:
    "M8.051 1.999h.089c.822.003 4.987.033 6.11.335a2.01 2.01 0 0 1 1.415 1.42c.101.38.172.883.22 1.402l.01.104.022.26.008.104c.065.914.073 1.77.074 1.957v.075c-.001.194-.01 1.108-.082 2.06l-.008.105-.009.104c-.05.572-.124 1.14-.235 1.558a2.007 2.007 0 0 1-1.415 1.42c-1.16.312-5.569.334-6.18.335h-.142c-.309 0-1.587-.006-2.927-.052l-.17-.006-.087-.004-.171-.007-.171-.007c-1.11-.049-2.167-.128-2.654-.26a2.007 2.007 0 0 1-1.415-1.419c-.111-.417-.185-.986-.235-1.558L.09 9.82l-.008-.104A31.4 31.4 0 0 1 0 7.68v-.123c.002-.215.01-.958.064-1.778l.007-.103.003-.052.008-.104.022-.26.01-.104c.048-.519.119-1.023.22-1.402a2.007 2.007 0 0 1 1.415-1.42c.487-.13 1.544-.21 2.654-.26l.17-.007.172-.006.086-.003.171-.007A99.788 99.788 0 0 1 7.858 2h.193zM6.4 5.209v4.818l4.157-2.408L6.4 5.209z"
};

const listItems = ["Linkedin", "Instagram", "Facebook", "Twitter", "Youtube"];

const iconTemplate = (path) => {
  return `
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
      <path d="${path}" />
    </svg>
  `;
};

const listItemTemplate = (text, translateValue) => {
  return `
    <li class="dropdown-list-item">
      <button class="dropdown-button list-button" data-translate-value="${translateValue}%">
        <span class="text-truncate">${text}</span>
      </button>
    </li>
  `;
};

const renderListItems = () => {
  dropdownList.innerHTML += listItems
    .map((item, index) => {
      return listItemTemplate(item, 100 * index);
    })
    .join("");
};

window.addEventListener("load", () => {
  renderListItems();
});

const setDropdownProps = (deg, ht, opacity) => {
  root.style.setProperty("--rotate-arrow", deg !== 0 ? deg + "deg" : 0);
  root.style.setProperty("--dropdown-height", ht !== 0 ? ht + "rem" : 0);
  root.style.setProperty("--list-opacity", opacity);
};

mainButton.addEventListener("click", () => {
  const listWrapperSizes = 3.5; // margins, paddings & borders
  const dropdownOpenHeight = 4.6 * listItems.length + listWrapperSizes;
  const currDropdownHeight =
    root.style.getPropertyValue("--dropdown-height") || "0";

  currDropdownHeight === "0"
    ? setDropdownProps(180, dropdownOpenHeight, 1)
    : setDropdownProps(0, 0, 0);
});

dropdownList.addEventListener("mouseover", (e) => {
  const translateValue = e.target.dataset.translateValue;
  root.style.setProperty("--translate-value", translateValue);
});

dropdownList.addEventListener("click", (e) => {
  const clickedItemText = e.target.innerText.toLowerCase().trim();
  const clickedItemIcon = icons[clickedItemText];

  dropdownTitleIcon.innerHTML = iconTemplate(clickedItemIcon);
  dropdownTitle.innerHTML = clickedItemText;
  setDropdownProps(0, 0, 0);
});

dropdownList.addEventListener("mousemove", (e) => {
  const iconSize = root.style.getPropertyValue("--floating-icon-size") || 0;
  const x = e.clientX - dropdownList.getBoundingClientRect().x;
  const y = e.clientY - dropdownList.getBoundingClientRect().y;
  const targetText = e.target.innerText.toLowerCase().trim();
  const hoverItemText = icons[targetText];

  floatingIcon.innerHTML = iconTemplate(hoverItemText);
  root.style.setProperty("--floating-icon-left", x - iconSize / 2 + "px");
  root.style.setProperty("--floating-icon-top", y - iconSize / 2 + "px");
});

              
            
!
999px

Console