.hero_image {
    min-height: 100vh;
    background-color:yellow;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    }

.main {
    max-width:500px;
    margin:0 auto;
    padding:0 50px;
    background-color:pink;
    }


<div class="hero_image">
    <div class="main">
        <h1>Heading <br>couple of words</h1>
    </div>
</div>

<div class="main">
    <p>Lots of content</p>
</div>