Has anyone got known a technique/trick for overriding css style of the Office UI Fabric's component related to Spfx 1.4.0 (for the SP2019)?

More specifically I would like to update TextField red color border, when the validation fails. Update it to the color as in the default case - that correspond to the Peoplepicker style from the @pnp/spfx-controls-react. (The nice to have also would be to add the exclamation icon as before the validation error text.)

current state of the TextField

Peoplepicker style from the @pnp/spfx-controls-react.

TextField parts from the browser developer tools:

developer tools - elements

developer tools - css,

TIA, Mojmir.

1 Answer 1


I saved the validation result in state.

public componentDidUpdate() {


Test result: enter image description here

Tip:change the id to your element id

  • Hi Amos_MSFT, that seems to be a nice quick workaround runtime solution - thanks for that.
    – rychlmoj
    May 20, 2020 at 16:42
  • Hovewer I wonder, whether there is a declarative solution - how to generally rewrite component css / or styles for UI Fabric egeneral concept like validation,... I believe, there exist such a possiblity to extend styles by definition... (The following artice github.com/microsoft/fluentui/wiki/Component-Styling tells about styling of newer version of newly called Fluent UI, but it seems to me too advanced to understand it now and it in hig h probability does not suit to the Office UI Fabric React ver. 5.21 (which is related to the Spfx 1.4.x ))
    – rychlmoj
    May 20, 2020 at 16:46

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