Я приготовил для вас очень простой пример. Надеюсь, это поможет.
.aqua-gradient {
height: 300px;
background: linear-gradient(90deg, rgba(2, 0, 36, 1) 0%, rgba(233, 242, 233, 0.9878326330532213) 0%, rgba(0, 212, 255, 1) 51%, rgba(114, 156, 7, 1) 93%);
}
.image {
margin-top: -150px;
}
.avatar-container {
width: 90%;
border: 1px solid #eee;
}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<div class="avatar-container text-center mx-auto">
<div class="card-up aqua-gradient"></div>
<!-- Avatar -->
<div class="avatar mx-auto white">
<img src="https://mdbootstrap.com/img/Photos/Avatars/img%20%2831%29.jpg" class="rounded-circle img-responsive bg-white p-3 image" alt="woman avatar">
</div>
<!-- Content -->
<div class="card-body">
<!-- Name -->
<h4 class="card-title font-weight-bold">Martha Smith</h4>
<hr>
<!-- Quotation -->
<p><i class="fas fa-quote-left"></i> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Eos, adipisci
</p>
</div>
</div>