how to make row across multiple css3 columns same height? - html

Question

I am trying to learn CSS grid, I have nested CSS grid and in which the parent CSS grid container has multiple columns each of them have 4 rows and I want the rows to be equal to each other for example height of the first row in the first column equal to the that in a second column.
#product-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-gap: 1em;
justify-items: center;
padding: 1em;
}
#product-grid img {
width: 100%;
height: 291px;
}
.product-item {
display: grid;
/* grid-auto-rows:1fr; */
grid-template-rows: 70px, 100px, 200px, 100px;
border-style: solid;
border-color: #2c4251;
border-width: 1px;
border-radius: 5px;
padding: 1em;
}
.cntnt {
text-align: justify;
overflow: hidden;
}
.product-item {}
.more {
text-align: left;
align-self: end;
}
.ttl {
margin-top: 20px;
text-align: center;
align-self: flex-start;
}
<div id="product-grid">
<div class='product-item'>
<img src=imgs/1.png>
<div class='ttl'>this is test title</div>
<div class='cntnt'>this is test caption</div>
<div class='more'>
<div><a href=/view.php?pid=1>more </a></div>
</div>
</div>
<div class='product-item'><img src=imgs/2.jpg>
<div class='ttl'>title</div>
<div class='cntnt'>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dolores, inventore? Officia perferendis</div>
<div class='more'>
<div><a href=/view.php?pid=2>more </a></div>
</div>
</div>
</div>