I m trying to move to the new boostrap 3 grid and I m facing some difficulties.
To implement any changes for tiny to small devices you will need to include your own media queries to add your own additional breakpoints.
For example:
@media (max-width: 480px) {
.no-float {
display:block;
float:none;
padding:0;
}
}
I am not quite sure what you are trying to achieve with this but this is how you would apply styles where the screen width is below 480px.