requirements:
Super large screen one line four
large screen one line two
small screen and one mobile phone line
Code implementation is as follows:

</div>
</div>

question:

1. doesn"t the total in row add up to 12? the total of col-lg on my side is obviously more than 12. So is col-sm col-xs, which doesn"t meet the bootstrap requirements.
2. how should a requirement like this be implemented