HTML CSS Fit image in fixed size - html

Question

I know this topic has been featured a couple times but none of the answers given to those questions fixed my problem. That's why I'm asking it here. I have a site where I have a standard Bootstrap card with an Image above it, But It looks like this
How can I make the images so they automatically fit in the middle and don't look like they're stretched out?
This is my HTML code (There is no CSS attached, Its standard bootstrap)
<div class="row mt-4">
<div class="col-md-4">
<div class="card mb-4">
<div class="card-image">
<img class="card-img-top" src="images/example.png">
</div>
<div class="card-header">
<h6 class="m-0">Some text</h6>
</div>
<div class="card-body" style="height: 130px">
<p class="m-0">Some text</p>
</div>
<div class="card-footer">
Footer
</div>
</div>
</div>
</div>

Answer 1

The best thing to do is to use the image as a background in conjunction with background cover. This will allow the photo to grow and resize without looking wonky.
.card-header {
height:200px;
background-image:url('http://www.fillmurray.com/g/500/200');
background-size:cover;
background-position:center center;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>
<div class="row mt-4">
<div class="col-md-4">
<div class="card mb-4">
<div class="card-image">
<img class="card-img-top sr-only" src="images/example.png">
</div>
<div class="card-header">
<h6 class="m-0">Some text</h6>
</div>
<div class="card-body" style="height: 130px">
<p class="m-0">Some text</p>
</div>
<div class="card-footer">
Footer
</div>
</div>
</div>
</div>

Answer 2

add this to your 'img' styling:
img { height: 200px;width:100%;object-fit: cover; }