4. Within the Grid Rows Styles section, create a style rule to set the width of each div element of the row class to 100% of its container, displaying the row only when its clear of floated content on both margins.

5. Create a style rule to allow grid rows to expand around all of their floated content.

6. Go to the Grid Columns Style section. Create a style rule to float every div element whose class name begins with column on the left. 7. Create style rules for div elements belonging to the following classes: column100, column50, column33, column67, column25, column75, column20, column40, column60, and column80 so that the width of each column is a percent equal to the size value. For example, div elements belonging to the column100 class should have widths of 100%, column50 should have widths of 50%, and so forth.

8. Go to the Grid Spacing Styles section. Create a style rule to apply the Border Box model to the div elements belonging to the following classes: container, row, classes that begin with column, cell, and a elements nested within div elements belonging to the cell class.

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