grid-template: 
            "a a a" 40px
            "b c c" 40px
            "b c c" 40px / 1fr 1fr 1fr;

grid-template: 
            "b b a" auto
            "b b c" 2ch
            "b b c" 1em / 20% 20px 1fr;

grid-template: 
            "a a ." minmax(50px, auto)
            "a a ." 80px
            "b b c" auto / 2em 3em auto;