codepens/tabbar-animationonly-css/dist/style.css

.tabs {
  --background: #FFFFFF;
  --light-grey: #C6CFD9;
  --wave-color: #2AC8DD;
  --width: 300px;
  --height: 75px;
  --border-radius: var(--height);
  background: var(--background);
  width: var(--width);
  height: var(--height);
  padding: 0;
  position: relative;
  border-radius: var(--border-radius);
  box-shadow: 0 10px 30px rgba(65, 72, 86, 0.05);
  display: -webkit-box;
  display: flex;
  justify-content: space-around;
  -webkit-box-align: center;
          align-items: center;
  padding: 0 15px;
  box-sizing: border-box;
  overflow: hidden;
}
.tabs label {
  width: 26px;
  height: 26px;
  cursor: pointer;
  position: relative;
  display: -webkit-box;
  display: flex;
  justify-content: space-around;
  -webkit-box-align: center;
          align-items: center;
  -webkit-transform-origin: center bottom;
          transform-origin: center bottom;
}
.tabs label::before {
  content: "";
  height: 4px;
  width: 4px;
  border-radius: 0% 100% 50% 50% / 0% 50% 50% 100%;
  -webkit-transform: scale(1, 1) rotate(45deg);
          transform: scale(1, 1) rotate(45deg);
  -webkit-transform-origin: 50% 50%;
          transform-origin: 50% 50%;
  background: var(--wave-color);
  display: block;
  position: absolute;
  top: -30px;
}
.tabs label svg {
  width: 100%;
  height: 100%;
  position: relative;
  z-index: 1;
}
.tabs label svg .icon {
  fill: none;
  stroke: var(--light-grey);
  stroke-dashoffset: 98;
  stroke-width: 2px;
  stroke-linecap: round;
  stroke-linejoin: round;
  -webkit-transition: stroke .15s linear .3s;
  transition: stroke .15s linear .3s;
}
.tabs label .wave {
  height: 26px;
  width: 26px;
  position: absolute;
  overflow: hidden;
}
.tabs label .wave::before, .tabs label .wave::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -12px;
  right: 0;
  background-repeat: repeat;
  height: 14px;
  width: 48px;
  background-size: 12px 12px;
  -webkit-animation: wave-animation 3s linear infinite;
          animation: wave-animation 3s linear infinite;
  -webkit-transition: bottom .15s ease-out .35s;
  transition: bottom .15s ease-out .35s;
}
.tabs label .wave::before {
  background-image: radial-gradient(circle at 6px -3px, transparent 6px, var(--wave-color) 6px);
  -webkit-animation-duration: 2s;
          animation-duration: 2s;
  opacity: .5;
}
.tabs label .wave::after {
  background-image: radial-gradient(circle at 6px -3px, transparent 6px, var(--wave-color) 6px);
  -webkit-animation-duration: 3s;
          animation-duration: 3s;
}
.tabs label:nth-of-type(1) .wave {
  -webkit-clip-path: url(#path-icon-01);
          clip-path: url(#path-icon-01);
}
.tabs label:nth-of-type(2) .wave {
  -webkit-clip-path: url(#path-icon-02);
          clip-path: url(#path-icon-02);
}
.tabs label:nth-of-type(3) .wave {
  -webkit-clip-path: url(#path-icon-03);
          clip-path: url(#path-icon-03);
}
.tabs label:nth-of-type(4) .wave {
  -webkit-clip-path: url(#path-icon-04);
          clip-path: url(#path-icon-04);
}
.tabs input {
  display: none;
}
.tabs input:checked + label {
  -webkit-animation: wiggle-animation 1s ease .3s;
          animation: wiggle-animation 1s ease .3s;
}
.tabs input:checked + label::before {
  -webkit-animation: drop-animation .35s ease-in both;
          animation: drop-animation .35s ease-in both;
}
.tabs input:checked + label svg .icon {
  stroke: #4B4B4B;
}
.tabs input:checked + label .wave:before {
  bottom: 0;
}
.tabs input:checked + label .wave:after {
  bottom: -4px;
}

@-webkit-keyframes wiggle-animation {
  0% {
    -webkit-transform: rotate(0deg);
            transform: rotate(0deg);
  }
  20% {
    -webkit-transform: rotate(-7deg);
            transform: rotate(-7deg);
  }
  60% {
    -webkit-transform: rotate(7deg);
            transform: rotate(7deg);
  }
  90% {
    -webkit-transform: rotate(-3deg);
            transform: rotate(-3deg);
  }
  100% {
    -webkit-transform: rotate(0deg);
            transform: rotate(0deg);
  }
}

@keyframes wiggle-animation {
  0% {
    -webkit-transform: rotate(0deg);
            transform: rotate(0deg);
  }
  20% {
    -webkit-transform: rotate(-7deg);
            transform: rotate(-7deg);
  }
  60% {
    -webkit-transform: rotate(7deg);
            transform: rotate(7deg);
  }
  90% {
    -webkit-transform: rotate(-3deg);
            transform: rotate(-3deg);
  }
  100% {
    -webkit-transform: rotate(0deg);
            transform: rotate(0deg);
  }
}
@-webkit-keyframes wave-animation {
  0% {
    -webkit-transform: translateX(0%);
            transform: translateX(0%);
  }
  100% {
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
  }
}
@keyframes wave-animation {
  0% {
    -webkit-transform: translateX(0%);
            transform: translateX(0%);
  }
  100% {
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
  }
}
@-webkit-keyframes drop-animation {
  70% {
    -webkit-transform: scale(0.8, 3) rotate(45deg);
            transform: scale(0.8, 3) rotate(45deg);
    top: -7px;
  }
  100% {
    -webkit-transform: scale(1.5, 0.5) rotate(45deg);
            transform: scale(1.5, 0.5) rotate(45deg);
    top: 19px;
  }
}
@keyframes drop-animation {
  70% {
    -webkit-transform: scale(0.8, 3) rotate(45deg);
            transform: scale(0.8, 3) rotate(45deg);
    top: -7px;
  }
  100% {
    -webkit-transform: scale(1.5, 0.5) rotate(45deg);
            transform: scale(1.5, 0.5) rotate(45deg);
    top: 19px;
  }
}
body {
  background: #eeeef5;
  height: 100vh;
  display: -webkit-box;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
          flex-direction: column;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
}
body .socials {
  position: fixed;
  display: block;
  left: 20px;
  bottom: 20px;
}
body .socials > a {
  display: block;
  width: 30px;
  opacity: .2;
  -webkit-transform: scale(var(--scale, 0.8));
          transform: scale(var(--scale, 0.8));
  -webkit-transition: -webkit-transform 0.3s cubic-bezier(0.38, -0.12, 0.24, 1.91);
  transition: -webkit-transform 0.3s cubic-bezier(0.38, -0.12, 0.24, 1.91);
  transition: transform 0.3s cubic-bezier(0.38, -0.12, 0.24, 1.91);
  transition: transform 0.3s cubic-bezier(0.38, -0.12, 0.24, 1.91), -webkit-transform 0.3s cubic-bezier(0.38, -0.12, 0.24, 1.91);
}
body .socials > a:hover {
  --scale: 1;
}