.header-drop-right-icon-bottom {
transform: rotate(0deg);
-ms-transform: rotate(0deg); /* IE 9 */
-moz-transform: rotate(0deg); /* Firefox */
-webkit-transform: rotate(0deg); /* Safari 和 Chrome */
-o-transform: rotate(0deg); /* Opera */
transition: transform 0.3s;
-moz-transition: transform 0.3s; /* Firefox 4 */
-webkit-transition: transform 0.3s; /* Safari 和 Chrome */
-o-transition: transform 0.3s; /* Opera */
}
