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print(const char[]) doesn't know that your const char[] is in PROGMEM
use the PROGMEM version of print() by casting the parameter to __FlashStringHelper used by F() macro
client.println((__FlashStringHelper*) StyleHTML);
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TimEllis:
Thanks for the reply.Where is __FlashStringHelper used by F() macro documented?
-tim
nowhere. it was meant to be a hidden helper. but in case where you don't want to use F() macro but a global PROGMEM string with Print class progmem functions, it is useful to know.
F() macro doc