Flex box does not align

Question

I am trying to make some cards using flexbox. But My boxes looks like this:

But I want them to look like this:

Heres my setup:

My class has these Bootstrap classes: pb-3 d-flex flex-row align-content-lg-start flex-wrap And the class has theese CSS styles:

padding: 0 !important;
height: calc(100vh - 57px);
flex-flow: row wrap !important;

Thanks beforehand! Best regards Max