Here are the patches for my custom footer style/size for 3.18.0.
Code:
<Patch>
patch_name = `Custom reading footer style`
patch_enable = `yes`
# Multi-version patch: 3.15.0 - 3.18.0+
#
# This patch customises the following properties of the reading footer:
#
# * Footer height (the amount of the screen reserved for the footer.)
# * Caption font size (Caption = page number or other progress indicator)
# * Caption top margin, which changes its vertical position within the footer.
#
# When editing the replacement values below, BE CAREFUL NOT TO CHANGE THE LENGTH
# OF THE REPLACEMENT STRING! If a replacement string is too long you will get
# an error when making the patch, but if one is too short then there will be no
# error, but strange things will happen to the reading footer.
#
find_base_address = `ReadingFooter {\n\tmin-height: 70px;`
#
# Replacement footer height values: Touch/Mini
replace_string = 0011, `min-height: 70px;`, `min-height: 32px;`
replace_string = 0024, `max-height: 70px;`, `max-height: 32px;`
# Replacement footer height values: Glo/Aura
replace_string = 0085, `min-height: 82px;`, `min-height: 40px;`
replace_string = 0098, `max-height: 82px;`, `max-height: 40px;`
# Replacement footer height values: AuraHD/H2O/GloHD
replace_string = 00DA, `min-height: 120px;`, `min-height: 030px;`
replace_string = 00EE, `max-height: 120px;`, `max-height: 030px;`
#
#
find_base_address = `#caption {\n\tfont-size: 16px;`
Replace_string = 0000, `#caption {\n\tfont-size: 16px;\n}\n\n#caption[qApp_deviceIsPhoenix="true"] {\n\tfont-size: 20px;\n}\n\n#caption[qApp_deviceIsDragon="true"] {\n\tfont-size: 26px;\n}\n\n#caption[qApp_deviceIsAlyssum="true"] {\n\tfont-size: 30px;\n}\n\n#caption[qApp_localeName="ja_JP"] {\n\tfont-family: Sans-SerifJP;\n}`, `#caption {font-size: 16px;margin-top: 00px;}\n#caption[qApp_deviceIsPhoenix="true"] {font-size: 20px;}\n#caption[qApp_deviceIsDragon="true"] {font-size: 26px;}\n#caption[qApp_deviceIsAlyssum="true"] {font-size: 30px;}\n#caption[qApp_localeName="ja_JP"] {font-family: Sans-SerifJP;}`
#
# Replacement caption font size value for Touch/Mini:
replace_string = 000A, `font-size: 16px;`, `font-size: 16px;`
# Replacement caption font size value for Glo/Aura:
replace_string = 0054, `font-size: 20px;`, `font-size: 20px;`
# Replacement caption font size value for AuraHD/H2O:
replace_string = 008C, `font-size: 26px;`, `font-size: 26px;`
# Replacement caption font size value for GloHD:
replace_string = 00C5, `font-size: 30px;`, `font-size: 30px;`
#
# Replacement caption top margin value for all devices:
# (A negative top margin moves the caption text upwards,
# further from the bezel and closer to the page content.)
replace_string = 001A, `margin-top: 00px;`, `margin-top:-10px;`
#
# Uncomment to use a fixed replacement caption font family, for all devices:
# (You can change Avenir to another font name of your choice, but Avenir or
# Georgia are recommended because other fonts may not be loaded when the book
# is first opened and so might cause problems. Unlike other strings it is OK
# if this replacement string is a bit longer or shorter than the original.)
#replace_string = 00D7, `#caption[qApp_localeName="ja_JP"] {font-family: Sans-SerifJP;}`, `#caption {font-family: Avenir;}
</Patch>
<Patch>
patch_name = `Custom footer`
patch_enable = `yes`
# Multi-version patch: 2.8.1 - 3.18.0+
#
# Changes the footer text with something shorter
# (not sure how it affects translations)
#
find_base_address = `Page %1 <i>of</i> %2`
replace_string = 0000, `Page %1 <i>of</i> %2`, `%1 / %2`
</Patch>