.song-list img{
float: right;
transform: rotate(90deg);
position: relative;
top: 0;
transition: all cubic-bezier(.46,.03,.52,.96)0.4s 0.2s;
}
.mw-collapsible-toggle-expanded .song-list img{
transform: rotateY( 180deg );
position: relative;
top: -0.1px;
left: -0.5px;
}