MyHeader.vue

<template>
    <div>
        <h1 class="header-title">   
            <slot name="title" />
        </h1>
        <h2 class="title-author">
            <slot name="author" />
        </h2>
    </div>
</template>

<style>
    html, body, * {
        font-size: 1.2em;
        background: #fafafa;
    }
</style>