sogo/UI/WebServerResources/scss/components/textField/textField-theme.scss

md-input-group.md-THEME_NAME-theme {
  input, textarea {
    text-shadow: '{{foreground-shadow}}';
    @include input-placeholder-color('{{foreground-3}}');
  }

  label {
    text-shadow: '{{foreground-shadow}}';
    color: '{{foreground-3}}';
  }

  input, textarea {
    color: '{{foreground-1}}';
    border-color: '{{foreground-4}}';
  }

  &.md-input-focused {
    input, textarea {
      border-color: '{{primary-500}}';
    }
    label {
      color: '{{primary-500}}';
    }
    &.md-accent {
      input, textarea {
        border-color: '{{accent-500}}';
      }
      label {
        color: '{{accent-500}}';
      }
    }
  }

  &.md-input-has-value:not(.md-input-focused) {
    label {
      color: '{{foreground-2}}';
    }
  }

  .md-input[disabled] {
    border-bottom-color: '{{foreground-4}}';
    color: '{{foreground-3}}';
  }
}