img{
position:absolute;
top: 0;
left: 0;
z-index: 1;
max-width:100%;
}
.hero__container{
z-index:2;
position:relative;
}
<div class="hero">
<div class="hero__container">
<div class="hero__description container">
<h1 class="hero__title">Become an outstanding List</h1>
<h3 class="hero__subtitle">Through one of our training programs at MSCoL</h3>
<a href="/" class="hero__button">Join the team</a>
</div>
</div>
</div>
.hero{
background: url(http://images.vfl.ru/ii/1568893523/c9258e21/27915042.jpg) no-repeat bottom left;
background-size:cover;
padding: 100px 0;
}
.hero__button {
display: block;
max-width: 170px;
margin-top: 50px;
text-align: center;
color: #fff;
padding: 20px;
background-color: red;
border-radius: 4px;
transition: transform .5s;
}