css grid auto wrap

Use this if you are trying to wrap your rows in css grid like with
flex-wrap.

grid-template-columns: repeat(auto-fill, <your-size>px);   

this one will provide a more responsive behavior as you can specify the
minimum size to start wrapping and max size so it grows and adapts to 
bigger screens

grid-template-columns: repeat(auto-fill, minmax(300px, 3fr));