.test1 {
  background-image: url('https://www.tobu.saiseikai.or.jp/wordpress/wp-content/themes/tobu/imgs/common/ghead/gnav05.png');
  }
  
.test1 {
background-image: url('https://www.tobu.saiseikai.or.jp/wordpress/wp-content/themes/tobu/imgs/common/ghead/gnav05_active.png');
}