You can change the text decoration of the cell to change its look and feel.
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Text Decoration
Various options are available in Home tab of the ribbon as mentioned below.
Bold − It makes the text in bold by choosing Home » Font Group » Click B or Press Control + B.
Italic − It makes the text italic by choosing Home » Font Group » Click I or Press Control + I.
Underline − It makes the text to be underlined by choosing Home » Font Group » Click U or Press Control + U.
Double Underline − It makes the text highlighted as double underlined by choose Home » Font Group » Click arrow near U » Select Double Underline.
More Text Decoration Options
There are more options available for text decoration in Formatting cells » Font Tab » Effects cells as mentioned below.
Strike-through − It strikes the text in the center vertically.
Super Script − It makes the content to appear as a super script.
Sub Script − It makes content to appear as a sub script.