led-server/htdocs/scss/free/_forms.scss

// Forms basic
// Input + label wrapper styles
.md-form {
  // Text inputs
  input[type=text],
  input[type=password],
  input[type=email],
  input[type=url],
  input[type=time],
  input[type=date],
  input[type=datetime-local],
  input[type=tel],
  input[type=number],
  input[type=search-md],
  input[type=search],
  textarea.md-textarea {
    // General Styles
    transition: $input-transition;
    outline: none;
    box-shadow: none;
    border: none;
    border-bottom: 1px solid $input-border-color;
    border-radius: 0;
    box-sizing: content-box;
    background-color: transparent;

    // Focused input style
    &:focus:not([readonly]) {
      box-shadow: 0 1px 0 0 $input-md-focus-color;
      border-bottom: 1px solid $input-md-focus-color;
      // Focused label style
      + label {
        color: $input-md-focus-color;
      }
    }

    // Form message shared styles
    + label:after {
      content: "";
      position: absolute;
      top: $input-label-after-top;
      display: block;
      opacity: 0;
      transition: $input-label-after-transition;
    }

    // Valid input style
    &.valid, &:focus.valid {
      border-bottom: 1px solid $input-success-color;
      box-shadow: 0 1px 0 0 $input-success-color;
    }

    &.valid + label:after, &:focus.valid + label:after {
      content: attr(data-success);
      color: $input-success-color;
      opacity: 1;
    }
    // Invalid input style
    &.invalid, &:focus.invalid {
      border-bottom: 1px solid $input-error-color;
      box-shadow: 0 1px 0 0 $input-error-color;
    }
    &.invalid + label:after, &:focus.invalid + label:after {
      content: attr(data-error);
      color: $input-error-color;
      opacity: 1;
    }

    &.form-control.valid + label:after,
    &.form-control:focus.valid + label:after  {
      top: $input-label-valid-top;
    }
    &.form-control.invalid + label:after,
    &.form-control:focus.invalid + label:after  {
      top: $input-label-invalid-top;
    }
    &.form-control-lg.valid + label:after,
    &.form-control-lg:focus.valid + label:after  {
      top: $input-label-valid-top-lg;
    }
    &.form-control-lg.invalid + label:after,
    &.form-control-lg:focus.invalid + label:after  {
      top: $input-label-invalid-top-lg;
    }
    &.form-control-sm.valid + label:after,
    &.form-control-sm:focus.valid + label:after  {
      top: $input-label-valid-top-sm;
    }
    &.form-control-sm.invalid + label:after,
    &.form-control-sm:focus.invalid + label:after  {
      top: $input-label-invalid-top-sm;
    }
  }

  .was-validated {
    input[type=text] {
      &:valid {
        + label {
          color: $input-success-color !important;
        }
      }
      &:invalid {
        + label {
          color: $input-error-color !important;
        }
      }
    }
    .form-control {
      &:valid:focus {
        box-shadow: 0 1px 0 0 $input-success-color !important;
      }
      &:valid {
        border-color: $input-success-color !important;
      }
      &:invalid:focus {
        box-shadow: 0 1px 0 0 $input-error-color !important;
      }
      &:invalid {
        border-color: $input-error-color !important;
      }
    }
  }

  // Input with label
  .form-control {
    margin: 0 0 $input-form-control-margin-bottom 0;
    border-radius: 0;
    padding: $input-form-control-padding-top 0 $input-form-control-padding-bottom 0;
    background-image: none;
    background-color: transparent;
    height: auto;
    &:focus {
      box-shadow: none;
      background: transparent;
    }
    &:disabled,
    &[readonly] {
      border-bottom: 1px solid $grey-lighten-1;
      background-color: transparent;
    }
  }

  @include make-input($input-validate-mb, $input-label-font-size, $input-label-active-font-size, $input-prefix-top, $input-prefix-font-size, $input-prefix-margin-left, $input-prefix-width, $input-form-text-ml);
  position: relative;
  margin-top: $input-md-form-margin-top;
  margin-bottom: $input-md-form-margin-bottom;
  label {
    position: absolute;
    top: $input-label-top;
    left: 0;
    transition: $input-label-transition;
    cursor: text;
    color: $input-label-color;
    &.active {
      transform: $input-label-active-transform;
    }
  }
  .prefix {
    position: absolute;
    transition: $input-prefix-transition;
    &.active {
      color: $input-md-focus-color;
    }
  }
  &.form-lg {
    @include make-input($input-validate-mb-lg, $input-label-font-size-lg, $input-label-active-font-size-lg, $input-prefix-top-lg, $input-prefix-font-size-lg, $input-prefix-margin-left-lg, $input-prefix-width-lg, $input-form-text-ml-lg);
  }
  &.form-sm {
    @include make-input($input-validate-mb-sm, $input-label-font-size-sm, $input-label-active-font-size-sm, $input-prefix-top-sm, $input-prefix-font-size-sm, $input-prefix-margin-left-sm, $input-prefix-width-sm, $input-form-text-ml-sm);
  }

  // Textarea
  textarea {
    &.md-textarea {
      overflow-y: hidden;
      padding: $textarea-padding 0;
      resize: none;
    }
    &.md-textarea-auto {
      padding: 0;
      padding-top: $textarea-padding;
    }
  }
}