The Basmalah (please do correct this mistake of letter a instead of i and write it as Bismillah) and between two surahs on your site.
Assalaam alaikum and thank you for your feedback. The word “al-basmalah” () indicates the phrase , just as the word “al-isti’aadhah” () indicates the phrase , and the word “takbeer” represents the phrase . There are many times in the Arabic language where a word is used to represent a phrase.
There was no mistake then, the word represents the phrase and is written with a fat-h on the ba’.