Getting Caption text for images to be center aligned

Hi Tom, David and Leo

I was wondering if there is a setting I am missing to get the text in captions on images to be center aligned?

I currently have this css in the additional css setting in Customise but if I don't need to do this I'd like to remove it.

/* START OF Make Img Caption Centre-Aligned*/
.wp-caption .wp-caption-text {
width: 100%;
text-align: center;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
}
/* END OF Make Img Caption Centre-Aligned*/

As always your help is appreciated.

Cheers Jodie