.details-button image {
  transition: 250ms;
}
.details-button.expanded:dir(ltr) image {
  -gtk-icon-transform: rotate(0.25turn);
}
.details-button.expanded:dir(rtl) image {
  -gtk-icon-transform: rotate(-0.25turn);
}

image.error { color: @error_color; }
image.warning { color: @warning_color; }