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HTML 

              
                <!-- 
@chrisbautista @codespud
codespud.com
The markup for each tabbar are exactly the same with some  minor changes to first and third tab style. Both of which require a second element to accomplish the animation.
-->
<div class="container stage">

  <div class="container">
    <div class="tabbar tab-style3">
      <ul class="flex-center">
        <li class="home active" data-where="home"><span class="material-icons-outlined">
            home
          </span></li>
        <li class="products" data-where="products"><span class="material-icons-outlined">
            shopping_bag
          </span></li>
        <li class="services" data-where="services"><span class="material-icons-outlined">
            plumbing
          </span></li>
        <li class="about" data-where="about"><span class="material-icons-outlined">
            business
          </span></li>
        <li class="help" data-where="help"><span class="material-icons-outlined">
            help_outline
          </span></li>
        <li class="follow">&nbsp;</li>
      </ul>
    </div>
  </div>

  <div class="container">
    <div class="tabbar tab-style2">
      <ul class="flex-center">
        <li class="home active" data-where="home"><span class="material-icons-outlined">
            home
          </span></li>
        <li class="products" data-where="products"><span class="material-icons-outlined">
            shopping_bag
          </span></li>
        <li class="services" data-where="services"><span class="material-icons-outlined">
            plumbing
          </span></li>
        <li class="about" data-where="about"><span class="material-icons-outlined">
            business
          </span></li>
        <li class="help" data-where="help"><span class="material-icons-outlined">
            help_outline
          </span></li>
      </ul>
    </div>
  </div>

  <div class="container">
    <div class="tabbar tab-style1">
      <ul class="flex-center">
        <li class="home active" data-where="home"><span class="material-icons-outlined">
            home
          </span></li>
        <li class="products" data-where="products"><span class="material-icons-outlined">
            shopping_bag
          </span></li>
        <li class="services" data-where="services"><span class="material-icons-outlined">
            plumbing
          </span></li>
        <li class="about" data-where="about"><span class="material-icons-outlined">
            business
          </span></li>
        <li class="help" data-where="help"><span class="material-icons-outlined">
            help_outline
          </span></li>
        <li class="follow">&nbsp;</li>
      </ul>
    </div>
  </div>

  <div class="container">
    <div class="tabbar tab-style4">
      <ul class="flex-center">
        <li class="home active" data-where="home"><span class="material-icons-outlined">
            home
          </span></li>
        <li class="products" data-where="products"><span class="material-icons-outlined">
            shopping_bag
          </span></li>
        <li class="services" data-where="services"><span class="material-icons-outlined">
            plumbing
          </span></li>
        <li class="about" data-where="about"><span class="material-icons-outlined">
            business
          </span></li>
        <li class="help" data-where="help"><span class="material-icons-outlined">
            help_outline
          </span></li>
      </ul>
    </div>
  </div>

  <div class="container">
    <div class="tabbar tab-style5">
      <ul class="flex-center">
        <li class="home active" data-where="home"><span class="material-icons-outlined">
            home
          </span></li>
        <li class="products" data-where="products"><span class="material-icons-outlined">
            shopping_bag
          </span></li>
        <li class="services" data-where="services"><span class="material-icons-outlined">
            plumbing
          </span></li>
        <li class="about" data-where="about"><span class="material-icons-outlined">
            business
          </span></li>
        <li class="help" data-where="help"><span class="material-icons-outlined">
            help_outline
          </span></li>
      </ul>
    </div>
  </div>
  <!--tab-style5-->
</div>

<div class="site-url-container"><a href="https://codespud.com" target="_blank">Codespud.com</a> </div>
!

CSS 

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

@import url("https://fonts.googleapis.com/icon?family=Material+Icons+Outlined");

/** 
@chrisbautista @codespud
animated tabs using only css transitions.

I wanted to test how much we can accomplish with just CSS transitions. No keyframe animations at all.
**/

:root {
  --accent-color: #1fa8f5;
  --accent-color-fg: #fefefe;
  --backdrop-color: #89d4fe;
  --app-content-background-color: #c0d8ec;
  --inset-shadow: rgba(7, 43, 74, 0.3);
  --outset-shadow: rgba(223, 240, 255, 0.25);
  --clay-box-shadow: rgba(7, 43, 74, 0.3);
  --clay-background-color: #c0d8ec;
  --clay-fg-color: #444;
}

body {
  background-color: var(--backdrop-color);
  font-size: 10px;
  font-family: "Roboto", sans-serif;
}

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

.container {
  padding: 1rem 1rem 1.5rem;
}

// start here

.stage {
  max-width: 400px;
  width: 400px;
  margin: 1rem auto 2rem;
}

.home {
  &.active {
    color: var(--accent-color);
  }

  &-style {
    --app-content-background-color: #c0d8ec;
  }
}

.products {
  &.active {
    --outset-shadow: rgba(247, 167, 103, 0.45);
    --inset-shadow: rgba(149, 62, 8, 0.45);
    --clay-box-shadow: rgba(211, 69, 20, 0.4);
    --clay-background-color: #d34514;
    --clay-fg-color: #f1f2f3;

    color: #690c0c;
  }

  &-style {
    --app-content-background-color: #d36e5a;
  }
}

.services {
  &.active {
    --outset-shadow: rgba(255, 159, 40, 0.45);
    --inset-shadow: rgba(88, 54, 13, 0.45);
    --clay-box-shadow: rgba(88, 54, 13, 0.4);
    --clay-background-color: #ed9426;
    --clay-fg-color: #f1f2f3;

    color: #cf5c0f;
  }

  &-style {
    --app-content-background-color: #ed9426;
  }
}

.about {
  &.active {
    --outset-shadow: rgba(93, 255, 85, 0.45);
    --inset-shadow: rgba(28, 78, 26, 0.45);
    --clay-box-shadow: rgba(28, 78, 26, 0.4);
    --clay-background-color: #4dd146;
    --clay-fg-color: #f1f2f3;

    color: #4dd146;
  }

  &-style {
    --app-content-background-color: #4dd146;
  }
}

.help {
  &.active {
    --outset-shadow: rgba(230, 230, 230, 0.45);
    --inset-shadow: rgba(81, 81, 81, 0.45);
    --clay-box-shadow: rgba(81, 81, 81, 0.4);
    --clay-background-color: #a3a3a3;
    --clay-fg-color: #f1f2f3;

    color: #783896;
  }

  &-style {
    --app-content-background-color: #a3a3a3;
  }
}

.tabbar {
  background-color: var(--app-content-background-color);
  border-bottom-left-radius: 1rem;
  border-bottom-right-radius: 1rem;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  height: 120px;
  display: flex;
  flex-direction: column;
  box-sizing: content-box;
  position: relative;
  overflow: hidden;
  transition: background-color 0.4s;

  ul,
  li {
    list-style-type: none;
    margin: 0;
    padding: 0;
  }

  ul {
    position: absolute;
    bottom: 0;
    width: 100%;
    background-color: #f9f8fa;
    align-self: flex-end;
    justify-content: center;
    height: 50px;
  }
  li {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1rem;
    margin-right: 5px;
    transition: all 0.4s;
    background-color: #f9f8fa;
    width: 60px;
    height: 60px;
    position: relative;
    color: #888;
    cursor: pointer;

    &:last-child {
      margin-right: 0;
    }
  }
}

.tab-style1 {
  ul {
    justify-content: center;
  }

  li {
    display: flex;
    justify-content: center;
    align-items: center;
    top: 1px;
    left: 0;
    width: 60px;
    height: 50px;
    transition: top 0.2s ease-out, width 0.4s, border-radius 0.4s,
      box-shadow 0.4s;

    &.follow {
      position: absolute;
      border-radius: 100%;
      content: " ";
      width: 60px;
      height: 60px;
      border: 10px solid var(--app-content-background-color);
      background-color: var(--app-content-background-color);
      top: -3rem;
      transition: left 0.4s ease-in, background-color 0.4s, border-color 0.4s;

      &:before,
      &:after {
        content: " ";
        position: absolute;
        top: 27px;
        right: -27px;
        border-top: 11px solid var(--app-content-background-color);
        background-color: #f9f8fa;
        width: 20px;
        height: 20px;
        box-sizing: border-box;
        transition: border-color 0.4s;
      }

      &::after {
        border-top-left-radius: 100%;
      }

      &:before {
        left: -27px;
        right: unset;
        border-top-right-radius: 100%;
      }
    }

    &:nth-child(1).active ~ .follow {
      left: 12px;
    }

    &:nth-child(2).active ~ .follow {
      left: 75px;
    }

    &:nth-child(3).active ~ .follow {
      left: 140px;
    }

    &:nth-child(4).active ~ .follow {
      left: 205px;
    }

    &:nth-child(5).active ~ .follow {
      left: 270px;
    }
  }

  .active {
    z-index: 100;
    width: 60px;
    height: 60px;
    top: -2rem;
    border-radius: 100%;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 8px 16px 0 rgba(0, 0, 0, 0.2);
  }
}

.tab-style2 {
  ul {
    justify-content: center;
  }

  li {
    border-top-left-radius: 100%;
    border-top-right-radius: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    top: 1px;
    left: 0;
    width: 60px;
    height: 50px;
  }

  .active {
    width: 60px;
    height: 60px;
    top: -1rem;

    span {
      font-size: 2rem;
    }

    &:before,
    &:after {
      position: absolute;
      content: " ";
      width: 13px;
      height: 13px;
      border-bottom: 4px solid #f9f8fa;
      top: 8px;
    }

    &:before {
      border-bottom-right-radius: 100%;
      left: -7px;
    }

    &:after {
      border-bottom-left-radius: 100%;
      right: -7px;
    }
  }
}

.tab-style3 {
  li {
    top: -8px;
    width: 60px;
    height: 35px;
    background-color: transparent;
    padding-top: 3px;

    &.follow {
      position: absolute;
      top: 0;
      display: flex;
      border-top: 3px solid #333;
      width: 60px;
      height: 1px;
      transition: all 0.3s ease-out;
    }

    &:nth-child(1).active ~ .follow {
      left: 20px;
      z-index: 20;
    }

    &:nth-child(2).active ~ .follow {
      left: 88px;
      z-index: 20;
    }

    &:nth-child(3).active ~ .follow {
      left: 149px;
      z-index: 20;
    }

    &:nth-child(4).active ~ .follow {
      left: 216px;
      z-index: 20;
    }

    &:nth-child(5).active ~ .follow {
      left: 283px;
      z-index: 20;
    }
  }
}

.tab-style4 {
  li {
    width: 60px;
    height: 40px;
    flex-direction: column;
    overflow: hidden;

    span {
      position: relative;
      top: 3px;
      transition: top 0.4s ease-out, font-size 0.2s ease-out;
      text-shadow: inset 2px 2px 4px var(--clay-box-shadow);
    }

    &:after {
      width: 100%;
      height: 10px;
      text-transform: uppercase;
      text-align: center;
      font-size: 8px;
      font-weight: bold;
      position: relative;
      bottom: -30px;
      opacity: 0;
      transition: bottom 0.2s ease-out, opacity 0.4s ease-out;
    }

    &.active:after {
      opacity: 1;
      bottom: 2px;
      text-shadow: inset 2px 2px 8px var(--clay-box-shadow);
    }

    &:nth-child(1) {
      &:after {
        content: "home";
      }
    }

    &:nth-child(2) {
      &:after {
        content: "products";
      }
    }

    &:nth-child(3) {
      &:after {
        content: "services";
      }
    }

    &:nth-child(4) {
      &:after {
        content: "company";
      }
    }

    &:nth-child(5) {
      &:after {
        content: "help";
      }
    }
  }

  .active {
    span {
      font-size: 1.1rem;
      top: -4px;
    }
  }
}

.tab-style5 {
  ul {
    justify-content: center;
  }

  li {
    display: flex;
    justify-content: center;
    align-items: center;
    top: 1px;
    left: 0;
    width: 60px;
    height: 50px;
    transition: top 0.4s ease-out, border-radius 0.4s ease-out,
      box-shadow 0.4s ease-out;
  }

  .active {
    width: 60px;
    height: 60px;
    border-radius: 100%;
    top: -1rem;
    background-color: var(--clay-background-color);
    box-shadow: 1px 2px 4px 0 var(--clay-box-shadow),
      2px 4px 8px 0 var(--clay-box-shadow),
      inset 2px 2px 8px var(--outset-shadow),
      inset -2px -2px 8px var(--inset-shadow);
    color: var(--clay-fg-color);

    span {
      font-size: 2rem;
    }
  }
}

.site-url-container {
  padding: 1rem;
  position: absolute;
  top: 0;
  right: 0;
  background-color: rgba(#fff, 0.5);
  padding: 0.5rem 0.8rem;
}
!

JS 

              
                /**
@chrisbautista @codespud
I did not want to add a bunch of checkboxes so I opted for setting the `active` class via javascript
**/

const uls = document.querySelectorAll("ul");

uls.forEach((ul) => {
  const resetClass = ul.parentNode.getAttribute("class");
  const lis = ul.querySelectorAll("li");

  lis.forEach((li) => {
    li.addEventListener("click", (e) => {
      e.preventDefault();
      e.stopPropagation();
      const target = e.currentTarget;

      if (
        target.classList.contains("active") ||
        target.classList.contains("follow")
      ) {
        return;
      }

      ul.parentNode.setAttribute(
        "class",
        `${resetClass} ${target.getAttribute("data-where")}-style`
      );

      lis.forEach((item) => clearClass(item, "active"));

      setClass(target, "active");
    });
  });
});

function clearClass(node, className) {
  node.classList.remove(className);
}

function setClass(node, className) {
  node.classList.add(className);
}
!
999px

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