You can change how text in a text box looks by changing its font, font style (bold or italic, for example), size, and color.
Select text, tap
, then tap Style.
Tap the font name to see more options for text size, color, and font.
Tap any font style button to add bold, italic, underline, or strikethrough to text.

Select the text, then tap
.
Tap Style, then tap the font name (for example, 11 pt Helvetica) below Style.
Tap Color, then choose one of the following:
A color that goes with the template: Swipe to the color choices to the left of the grayscale options, then tap a color.
Any color not predesigned for the template: Swipe to the color grid to the right of the grayscale options, then tap it. Swipe up and down in the grid to see all choices, then tap one.
To preview text in various colors, touch and hold a color, then drag across the grid. A color label appears for each previewed color to help you reproduce an exact match. Release your finger to select a color.
A color from elsewhere in the sheet: Swipe to the color grid to the right of the grayscale options, then tap it. Tap
. Touch any color outside of the selected object.
To preview colors in the object, touch and hold a color on the spreadsheet, then drag across the sheet to touch other colors. Release your finger to select a color.