'How to disable input outline in angular material

I use angular material mat-form-field and matInput. But input has this outline . How can i remove it?

<mat-form-field appearance="outline" class="form__item">
            <input
                matInput
                name="autocomplete"
                id="autocomplete"
                type="text"
                formControlName="city"
                placeholder="Start typing ..."
            />
        </mat-form-field>

angular angular-material

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'How to disable input outline in angular material

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