Issue and fix can be seen here:
http://imgur.com/a/TVIAX
In an iPad mini when ordering and typing the expiration date it's hard to read the labels in the textbox since it gets too narrow.
The fix was to change the col-xs-6 to col-xs-9, in \extensions\authorize_net_aim\views\authorize_net_aim.php
[php] <div class="col-xs-9 col-lg-6">
<input type="text" name="authorize_cc_exp_month" class="form-control" id="input-expiry-month" value="<?php echo set_value('authorize_cc_exp_month', $authorize_cc_exp_month); ?>" placeholder="<?php echo lang('text_exp_month'); ?>" autocomplete="off" required />
</div>
<div class="col-xs-9 col-lg-6">
<input type="text" name="authorize_cc_exp_year" class="form-control" id="input-expiry-year" value="<?php echo set_value('authorize_cc_exp_year', $authorize_cc_exp_year); ?>" placeholder="<?php echo lang('text_exp_year'); ?>" autocomplete="off" required />
</div>[/php]