CSS：

.navbar-inner {
  background-color: #2c2c2c; 
  background-image: none;
  background-image: none;
  background-image: none;
  background-image: none;
  background-image: none;
  background-image: none;
  background-repeat: no-repeat;
  filter: none;
}

background-image：none;必须多次使用以覆盖所有供应商前缀.