Create a Framework7 floating action button (FAB)

Build a Framework7 floating action button (FAB)

f7Fab(inputId, label, width = NULL, ..., flag = NULL)

Arguments

inputId	The `input` slot that will be used to access the value.
label	The contents of the button or link--usually a text label, but you could also use any other HTML, like an image.
width	The width of the input, e.g. `'400px'`, or `'100%'`; see `validateCssUnit()`.
...	Named attributes to be applied to the button or link.
flag	Additional text displayed next to the button content. Only works if f7Fabs position parameter is not starting with center-...