Hey! Can't quite seem to get this text box to align to the left only on mobile, can anyone help? Previous attempts shown

Site URL: https://www.ciarancosway.com

At the moment I have tried a few things.. I managed to make all the text go to the left on mobile, but I only really want this box. 
Alternatively, I think I'd be happy with making all text blocks aligned to the centre. 

Tried this:

@media only screen and (max-width:640px) 
{#block-yui_3_17_2_1_1646994820946_29973 
   {text-align:left !important; margin:auto} 
}

and this: 

 

@media only screen and (max-width:640px) 
{#block-yui_3_17_2_1_1646994820946_29973.sqs-block
  {text-align:left !important; margin:auto} }

and this: 

 

@media only screen and (max-width:640px) 
{.sqs-block
  {text-align:left !important; margin:auto} }

Appreciate the help!
 

Which box are you rererring to? Can you take a screenshot?