Remove empty space from the label

[sanjarcode]

Problem: Unnecessary Whitespace on the left of the label

Cause :In the stylesheet.css file, the classes have width and text-align
attributes. These attributes are not required, because the set_text()
function automatically resizes the label according to the text.

Justification for change :This was causing unnecessary space to appear on the left of the label.
If it was meant for disambiguation of labels, it is not required: because all labels already have icon prefix, viz Sigma,
down-arrow, up-arrow etc.