phpstorm/col-lg-offset

hi . i have problems with col-lg-offset in bootstrap in my phpstorm and i don`t know why it doesn`t utilize the codes of col-lg-offsets in the program and doesn`t change the result . here are my codes . 

<div class="container">

<div class="row">

<div class="col-lg-8 col-lg-offset-3" style="background-color: #e4606d;height: 100px;"></div>

<div class="col-lg-10 col-lg-offset-1" style="background-color: #c69500;height: 100px;"></div>

</div>

</div> 

also i sent an email to your team last night and they haven`t answered my question yet . please tell your team to work faster . thank you . 

and also tell them to check their emails cos i `ve already checked my spam . 

thank you .