My_Test_Repo/force-app/main/default/lwc/p2cChildComponent/p2cChildComponent.html

<template>
    <lightning-card title={heading}>
        <div class="slds-notify_alert slds-alert_error" role="alert">
           {message}
           {isVisible}
           {number}
        </div>
    </lightning-card>

</template>