Example of <PrimaryButton> vs <fluent-button>?

[thoffmann-fms]

Can someone point me to documentation that shows how to translate the React widget

          <PrimaryButton
            style={{ width: "85vw" }}
            text={this.props.intl.formatMessage({ id: "db.1040" })} // Search
            onClick={this.OnSearchClick}
            disabled={!this.state.isSearchButtonEnabled || thisState.isBusy || thisState.isMountBusy}
          />

to a Web equivalent

<fluent-button style="width: 85vw" onclick="runFunc();">Search</fluent-button>

and make the <fluent-button> look the same? Without adding some magic classes the <fluent-button> looks totally different.

React:

fluent-button:

[thoffmann-fms]

Sorry, just noticed the app has a bunch of custom CSS in the .ms-Buttton-??? classes.