Add one grid line in the middle of the div element, another one 200 pixels from the right, and another one in the middle of remaining space:
The grid-columns property is not supported in any of the major browsers.
The grid-columns property specifies the width of each column in the grid.
Tip: Using grid systems is a great value for print designers. Now the same concept is applied to online content. The grid properties add capabilities for sizing and positioning headings, text, and images in a scalable grid.
|length||Refers to the grid of the containing block|
|%||Refers to the width of the containing block|