The border-style property must be defined in order to see any border. Like the border-width property, the border-style property can also have from one to four values. The values for the border-style property are illustrated here:
4 Values: border-style: dotted solid double dashed;
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3 Values: border-style: dotted solid double;
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2 Values: border-style: dotted solid;
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1 Value: border-style: dotted;
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I've added a 7px padding to each bordered 'division'.