.arrow_img_open{-webkit-transform:rotate(180deg);transform:rotate(180deg)}.arrow_img,.arrow_img_open{-webkit-transition:-webkit-transform .5s;transition:-webkit-transform .5s;transition:transform .5s;transition:transform .5s,-webkit-transform .5s;height:20px}.arrow_img{-webkit-transform:rotate(1turn);transform:rotate(1turn)}