In custom module create your CSS file, and put it in the standard place : module/static/src/css/allign.css and then add to the list of css files to load in __openerp__.py : css:['static/src/css/allign.css']

The below code for right align data in tree view:-

In allign.css add the below line:-

.openerp .rallign {
  text-align: right;
}

In xml file add the below line:-

<tree string="Product" version="7.0">
    <field name="total" class="rallign"/>
</tree>

For right align labels the default base css base/static/src/css/allign.css Line:2928

.openerp .oe_list_content th.oe_sortable, .openerp .oe_list_content th.oe_sortable div {
    cursor: pointer;
    text-align: right; /* added this line */
}

The above right align Label all the modules. No idea about particular field Label in tree view.

you could add class on it in the xml view. and add the css in static.