解决Bootstrap 试用手机端 布满全屏

@media (max-width: 767px)

{
  body{
    margin: 0;
    padding: 0;
  }
}
@media (max-width: 970px)
{
  body{
    margin: 0;
    padding: 0;
  }container-fluid
}
@media (max-width: 480px)
{
  body{
    margin: 0;
    padding: 0;
  }container-fluid
}