Hi,
So sooooooorry, I missed your question, it was my mistake.
1.
Please login wp-admin, go to Appearance / Theme Options / Custom Css
Paste the style code to Custom Css:
.container-masonry .grid-item-inside , .grid-stack .grid-item-inside {
opacity: 1;
-webkit-transform: translateY(0);
-moz-transform: translateY(0);
transform: translateY(0);
}
2. The thumbnail would be cropped automatically. the image size better larger than 2000px
Cheers!
Bwsm