Flat bootstrap

.well, .navbar-inner, .popover, .btn, .tooltip,
input, select, textarea, pre, .progress, .modal,
.add-on, .alert, .table-bordered, .nav>li>a,
.dropdown-menu, .tooltip-inner, .badge, .label,
.img-polaroid, .thumbnail, .dropdown-toggle {
  -moz-box-shadow: none !important;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
  -webkit-border-radius: 0px !important;
  -moz-border-radius: 0px !important;
  border-radius: 0px !important;
  border-collapse: collapse !important;
  background-image: none !important;
}
 
.btn{
  border: none;
}