Hello,

Please remove the previous code and use this below custom css code in theme settings > custom css:

.blog-design-masonry .post-title {
     display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-line-clamp: 1; /* Change this value to control the number of lines */
}

Best Regards.