Bootstrap card-deck elements not getting the same proportions - css

Question

I'm displaying card decks in order to show a set of articles stored in a database. This is the pretty simple piece of code I'm using:
HTML
<div class="row">
<div class="card-deck">
<template is="dom-repeat" items="{{articles}}" as="article">
<div class="col-12 col-md-4 mb-md-5">
<div
class="card"
on-tap="showViewer"
data-id$="[[article.id]]"
>
<img
class="card-img-top img-fluid vertical-image"
src$="{{getArticleImage(article)}}"
onerror$="this.src='{{defaultimage}}'"
alt="{{getArticleDescription(article)}}"
/>
<div class="card-body d-flex flex-column justify-content-center py-2">
<div class="d-flex justify-content-start align-items-center mb-2">
<img class="icon-sm mr-2 img-fluid" src={{getFavIcon(article)}}>
<span class="medium-text">
{{getSources(article)}}
</span>
</div>
<p class="card-text primary-headline medium-text">
{{article.schema:headline}}
</p>
</div>
</div>
</div>
</template>
</div>
</div>
CSS
.vertical-image {
width: 100%;
height: auto;
object-fit: cover;
object-position: center;
}
.icon-sm {
height: 20px;
width: auto;
}
.medium-text {
font-family: Raleway-Medium;
}
.primary-headline {
font-size: 25px;
line-height: 25px;
text-align: justify;
}
According to Bootstrap documentation, using the card-deck class should make all the cards in the deck to have equal width and height. However, I'm not acheiving that behaviour. Here you are a picture where you can see what I am getting.
What would be the correct way to achieve that all the images in the cards and all the cards have the same height and width?

Answer 1

Check this. Hope it helps.
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container">
<div class="row">
<div class="col-sm-4 py-2">
<div class="card card-body h-100">
Card. I'm just a simple card-block.
</div>
</div>
<div class="col-sm-4 py-2">
<div class="card h-100 text-white bg-danger">
<div class="card-body">
<h3 class="card-title">Danger</h3>
<p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
Outline
</div>
</div>
</div>
<div class="col-sm-4 py-2">
<div class="card h-100 card-body">
Card. I'm just a simple card-block, but I have a little more text!
</div>
</div>
<div class="col-sm-4 py-2">
<div class="card h-100 border-primary">
<div class="card-body">
<h3 class="card-title">Primary</h3>
<p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
Outline
</div>
</div>
</div>
<div class="col-sm-4 py-2">
<div class="card h-100 card-body">
Card. I'm just a simple card-block.
</div>
</div>
<div class="col-sm-4 py-2">
<div class="card text-white bg-primary">
<div class="card-body">
<h3 class="card-title">Hello</h3>
<p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
Outline
</div>
</div>
</div>
</div>
</div>