媒体查询字体大小不起作用

我搜索过,但没有发现任何类似于我的问题.

#navigation {
  position: fixed;
  top: 0;
  width: 100%;
  color: #ffffff;
  height: 35px;
  text-align: center;
  padding-top: 15px;
  -webkit-box-shadow: 0px 0px 8px 0px #000000;
  -moz-box-shadow: 0px 0px 8px 0px #000000;
  box-shadow: 0px 0px 8px 0px #000000;
  background: url(../images/bg.jpg) repeat top left;
  z-index: 9999;
}
#navigation a {
  font-size: 15px;
  padding-left: 15px;
  padding-right: 15px;
  color: #F2B704;
  text-decoration: none;
}
#navigation a:hover {
  color: #D78E02;
}
@media only screen and (max-device-width: 480px) {
  #navigation a {
    font-size: 10px;
  }
}

  GALERIJA
  FESTIVAL
  KONTAKT