Stride not used in first CNN layer

Here you can see that in the first cnn layer ,we have not specified any value of stride but in the remaining cnn layers , we have specified that , Why ?
Will it make a difference if I specify stride=1 at the first layer ?

Simply: no. The docs don’t bite.

The default stride is already defined as 1

oh , its default is 1. I didnt notice that , thankyou