border radius

Hi Jacques,

I put a border-radius on the w3-card css element to round off the 4 corners. it works well for the upper angles but it is ineffective for the 2 lower angles.

https://ibb.co/wpnVcVS

I tried a border-radius left, right, top and bottom but nothing worked.
I removed the shadow from the cards but it doesn’t change anything about the expected result, the lower angles are still 90°.
I thought this problem was generated by the proximity of the cards to each other but the lower rows display the higher angles.

What is your expertise, Jacques ?

Thank you