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                <label for="inp" class="inp">
  <input type="text" id="inp" placeholder="&nbsp;">
  <span class="label">Label</span>
  <svg width="120px" height="26px" viewBox="0 0 120 26">
    <path d="M0,25 C21,25 46,25 74,25 C102,25 118,25 120,25"></path>
  <span class="border"></span>

<!-- dribbble -->
<a class="dribbble" href="" target="_blank"><span class="fa fa-dribbble"></span></a>



                html, body
  height: 100%

  display: grid
  font-family: Avenir
  -webkit-text-size-adjust: 100%
  -webkit-font-smoothing: antialiased
  overflow: hidden
  box-sizing: border-box
  position: relative
  margin: auto
  width: 100%
  max-width: 280px
    position: absolute
    top: 16px
    left: 0
    font-size: 16px
    color: #9098A9
    font-weight: 500
    transform-origin: 0 0
    transition: all .2s ease
    position: absolute
    left: 0
    bottom: 0
    height: 26px
    fill: none
      stroke: #C8CCD4
      stroke-width: 2
        transition: all .2s ease
    position: absolute
    bottom: 0
    left: 120px
    height: 2px
    right: 0
    background #C8CCD4
    -webkit-appearance: none
    width: 100%
    border: 0
    font-family: inherit
    padding: 12px 0
    height: 48px
    font-size: 16px
    font-weight: 500
    background: none
    border-radius: 0
    color: #223254
    transition: all .15s ease
      + span
        color #5A667F
        transform: translateY(-26px) scale(.75)
      background: none
      outline: none
      + span
        color #0077FF
        transform: translateY(-26px) scale(.75)
        transition-delay: .1s
        + svg
            stroke: #0077FF
            animation: elasticInput .4s ease forwards
          + .border
            background: #0077FF  
@keyframes elasticInput
    d: path("M2,2 C21,17 46,25 74,25 C102,25 118,25 120,25")
  position: fixed
  right: 20px
  bottom: 15px
  transition: all .2s ease
    font-size: 28px
    color: #9098A9