XenForo Изменяем фон редактора Xenforo 2

.message-cell.message-cell--user,
.message-cell.message-cell--main {
    position: relative;
}
.message-cell.message-cell--user::before,
.message-cell.message-cell--main::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('styles/hal/pngwing.com.png');
    background-size: cover;
    background-position: center;
    opacity: 0.3;
}/* если требуется разная картинка и прозрачность фона
.message-cell.message-cell--main::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('styles/hal/pngwing.com.png');
    background-size: cover;
    background-position: center;
    opacity: 0.3;
}*/
.message-actionBar.actionBar {
    position: relative;
    z-index: 9;
}
.formButtonGroup {
    z-index: 9;
    position: relative;
}
.message-attribution.message-attribution--split {
    z-index: 9;
}