Material like inputs

material-inputs.html

<div class="group">
  <input type="text" required>
  <span class="highlight"></span>
  <span class="bar"></span>
  <label>Nombre y Apellido</label>
</div>
<div class="group">
  <input type="text" required>
  <span class="highlight"></span>
  <span class="bar"></span>
  <label>Email</label>
</div>
<div class="group">
  <input type="text" required>
  <span class="highlight"></span>
  <span class="bar"></span>
  <label>Teléfono</label>
</div>

material-inputs.scss

/* form starting stylings ------------------------------- */

.group {
  margin-bottom: 25px;
  position: relative;
  padding-left: 16px;
}

input {
  width: 100%;
  font-size: 17px;
  padding: 10px 10px 10px 5px;
  display: block;
  border: none;
  border-bottom: 2px solid gray;
  &:focus {
    outline: none;
  }
}

/* LABEL ======================================= */

label {
  font-weight: normal;
  position: absolute;
  pointer-events: none;
  left: 16px;
  top: 10px;
  font-size: 17px;
  transition: 0.2s ease all;
  -moz-transition: 0.2s ease all;
  -webkit-transition: 0.2s ease all;
}

/* active state */

input {
  &:focus ~ label, &:valid ~ label {
    top: -18px;
    font-size: 14px;
    color: orange;
  }
}

/* BOTTOM BARS ================================= */

.bar {
  position: relative;
  display: block;
  width: 100%;
  &:before, &:after {
    content: '';
    height: 2px;
    width: 0;
    bottom: 1px;
    position: absolute;
    background: orange;
    transition: 0.2s ease all;
    -moz-transition: 0.2s ease all;
    -webkit-transition: 0.2s ease all;
  }
  &:before {
    left: 50%;
  }
  &:after {
    right: 50%;
  }
}

/* active state */

input:focus ~ .bar {
  &:before, &:after {
    width: 50%;
  }
}

/* HIGHLIGHTER ================================== */

.highlight {
  position: absolute;
  height: 60%;
  width: 100px;
  top: 25%;
  left: 0;
  pointer-events: none;
  opacity: 0.5;
}

/* active state */

input:focus ~ .highlight {
  -webkit-animation: inputHighlighter 0.3s ease;
  -moz-animation: inputHighlighter 0.3s ease;
  animation: inputHighlighter 0.3s ease;
}

/* ANIMATIONS ================ */
@-webkit-keyframes inputHighlighter {
  from {
    background: orange;
  }

  to {
    width: 0;
    background: transparent;
  }
}


@-moz-keyframes inputHighlighter {
  from {
    background: orange;
  }

  to {
    width: 0;
    background: transparent;
  }
}


@keyframes inputHighlighter {
  from {
    background: orange;
  }

  to {
    width: 0;
    background: transparent;
  }
}