If you want to style only 'one' caret ( or repetitive one kind) then you can use 'style' attribute to resize the caret. For eg:
This will not affect other caret elements and only the tag containing this 'border-width' attribute will be affected!
Alternatively, if you want to keep the style in your css file you can label id attribute:
And add the styling in your .css as follows:
#c1{
border-width:8px;
}