Bootstrap卡片高度与宽度设置异常的解决求助

各位好，我遇到了一个Bootstrap卡片布局的问题：我给所有卡片图片指定了固定的高宽，但卡片整体的高度却没法保持一致，有的卡片高一些，有的又矮一些，其中左数第二张图片对应的卡片高度明显偏大。我希望所有卡片能拥有完全相同的高度和宽度，请问该怎么解决这个问题呢？

我目前尝试的代码如下：

CSS 代码 #

.card {
height: 50%;
width: 50%;
}

.card {
background-color: #f8f9fa;
}

.card-body {
padding: 15px;
}

.card-img-top {
height: 200px;
width: 100%;
object-fit: cover;
}

.card .btn {
background-color: #007bff;
color: #fff;
}

HTML 代码 #

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">

<div class="row">

<div class="col-md-3 mb-4">
<div class="card">
<img th:src="@{/images/denim/BlackJen.jpg}" class="card-img-top" alt="Jeans Pant 1">
<div class="card-body">
<h5 class="card-title">Jeans Pant 1</h5>
<p class="card-text">Price: ₹49.99</p>
<a href="product1.html" class="btn btn-primary btn-block">View Details</a>
</div>
</div>
</div>

<div class="col-md-3 mb-4">
<div class="card">
<img th:src="@{/images/denim/blueJean.jpg}" class="card-img-top" alt="Jeans Pant 1">
<div class="card-body">
<h5 class="card-title">Jeans Pant 1</h5>
<p class="card-text">Price: ₹49.99</p>
<a href="product1.html" class="btn btn-primary btn-block">View Details</a>
</div>
</div>
</div>

<div class="col-md-3 mb-4">
<div class="card">
<img th:src="@{/images/denim/lightGray.jpg}" class="card-img-top" alt="Jeans Pant 1">
<div class="card-body">
<h5 class="card-title">Jeans Pant 1</h5>
<p class="card-text">Price: ₹49.99</p>
<a href="product1.html" class="btn btn-primary btn-block">View Details</a>
</div>
</div>
</div>

<div class="col-md-3 mb-4">
<div class="card">
<img th:src="@{/images/denim/LightGrayJe.jpg}" class="card-img-top" alt="Jeans Pant 1">
<div class="card-body">
<h5 class="card-title">Jeans Pant 1</h5>
<p class="card-text">Price: ₹49.99</p>
<a href="product1.html" class="btn btn-primary btn-block">View Details</a>
</div>
</div>
</div>

</div>

目前的问题是卡片高度不一致，尤其是左数第二张图的卡片高度明显过大，希望大家能帮我找出问题所在，给出可行的解决方案，谢谢！

备注：内容来源于stack exchange，提问作者Mama