helloWorld.html

<template>
    <lightning-card title="HelloWorld" icon-name="standard:custom_notification">
        <div class="slds-m-around_medium slds-p-around_small">
            <p>Welcome to, {greet}!</p>
            <lightning-input label="Name" value={greet} onchange={onNameChange}></lightning-input>
        </div>
    </lightning-card>
</template>