.dropzone .dz-preview.dz-success:hover .dz-success-mark {
    opacity: 100%;
    transition: opacity 0.5s;
}
.dropzone .dz-preview.dz-success .dz-success-mark {
    opacity: 0%;
    transition: opacity 0.5s;
}
/* .dz-processing */        
.dropzone .dz-preview .dz-details .progress-bytes {
    opacity: 0%;
}
.dropzone .dz-preview:not(.dz-success,.dz-error):hover .dz-details .progress-bytes {
    opacity: 100%;
    transition: opacity 0.5s;
}