Resize elements in same grid column to fit - html

Question

I have a CSS grid with several columns and many rows (I'm building a timetable view). The rows and columns are defined on the grid element itself, and then on the elements within the grid I set their column (always only one column) and their rows (might be more than one row).
An example is as follows:
.grid {
display: grid;
grid-template-rows: [row-a] 1fr [row-b] 1fr [row-c] 1fr [row-d] 1fr;
grid-template-columns: [col] 1fr;
flex-grow: 1;
}
.entry-one {
grid-column: col;
grid-row: row-a/row-d;
background-color: red;
}
.entry-two {
grid-column: col;
grid-row: row-b;
background-color: green;
}
<div class='grid'>
<div class='entry-one'>
Foobar
</div>
<div class='entry-two'>
Barfoo
</div>
</div>
Now, what I would like to have is that the elements resize themselves and flow nicely, such that they fit next to each other. I can mock this using width and margin on the elements:
.grid {
display: grid;
grid-template-rows: [row-a] 1fr [row-b] 1fr [row-c] 1fr [row-d] 1fr;
grid-template-columns: [col] 1fr;
flex-grow: 1;
}
.entry-one {
grid-column: col;
grid-row: row-a/row-d;
background-color: red;
width: 50%; /* ADDED */
}
.entry-two {
grid-column: col;
grid-row: row-b;
background-color: green;
width: 50%; /* ADDED */
margin-left: 50%; /* ADDED */
}
<div class='grid'>
<div class='entry-one'>
Foobar
</div>
<div class='entry-two'>
Barfoo
</div>
</div>
However this is not optimal, especially as the elements are inserted dynamically. Is there a way to have the elements size & align themselves automatically using CSS? I've tried to use display: flex on the entries, but that did not result in what I want (or maybe I forgot to add another rule).
Thank you for any ideas, and have a nice day!

Answer 1

I made this to see if that is what you are looking for
.grid{
display: flex;
grid-template-rows: [row-a] 1fr [row-b] 1fr [row-c] 1fr [row-d] 1fr;
grid-template-columns: [col] 1fr;
flex-grow: 1;
}
I just changed your display to flex and delete your margin-left: 50%; on the entry two, hope it is what you are looking for