CSS for Pinterest-like Masonry layout in Genesis. Details: http://sridharkatakam.com/using-masonry-genesis-pinterest-like-layout/

style.css

/****************************************************************
    Pinterest-like Masonry layout for Posts page and Archives
****************************************************************/

.masonry-page .content .entry {
	padding: 0;
	border-radius: 0;
	width: 255px;
	overflow: hidden;
}

.masonry-page .content .one-half,
.masonry-page .content .one-third,
.masonry-page .content .one-fourth,
.masonry-page .content .one-sixth {
	margin-left: 0;
}

.masonry-page .content .title-content {
	padding: 2rem;
}

.masonry-page .content .entry-title {
	font-size: 1.6rem;
	line-height: 1.4;
}

.masonry-page .content .entry-content a {
	border-bottom: none;
}

.masonry-page .content .entry-content p {
	margin-bottom: 0;
}

.masonry-page .content .entry-content p.entry-permalink {
	padding-left: 2rem;
	padding-right: 2rem;
}

.masonry-page .content .entry-content a.more-link {
	font-size: 1.4rem;
}

.masonry-page .content .entry-footer {
	padding: 1rem 2rem;
	border-top: 1px dashed #F5F5F5;
}

.masonry-page .content .entry-footer .entry-meta {
	margin: 0;
	padding: 0 0 1rem 0;
	border-top: none;
}

.masonry-page .content .entry-pagination {
	padding-left: 2rem;
	padding-right: 2rem;
}

/*Image hover*/
.masonry-page .content img.post-image {
    -khtml-opacity: 1;
    -moz-opacity: 1;
    opacity: 1;
    -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(opacity=100)"; /* IE 8 */
    filter: alpha(opacity=100); /* IE 4, 5, 6 and 7 */
    zoom:1 /* so the element "hasLayout" or, to trigger "hasLayout" set a width or height */
	-webkit-transition:  all .2s linear;
	-moz-transition:  all .2s linear;
	-o-transition:  all .2s linear;
	transition:  all .2s linear;
}
.masonry-page .content img.post-image:hover {
    -khtml-opacity: 0.7;
    -moz-opacity: 0.7;
    opacity: 0.7;
    -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(opacity=70)"; /* IE 8 */
    filter: alpha(opacity=70); /* IE 4, 5, 6 and 7 */
    zoom:1; /* so the element "hasLayout" or, to trigger "hasLayout" set a width or height */
}

/*Comment this out if infinite scrolling is NOT being used*/
.masonry-page .archive-pagination {
	display: none;
}

/* Infinite Scroll loader */
#infscr-loading {
  text-align: center;
  z-index: 100;
  position: fixed;
  left: 45%;
  bottom: 40px;
  width: 200px;
  padding: 10px;
  background: #000;
  opacity: 0.8;
  color: #FFF;
  -webkit-border-radius: 10px;
     -moz-border-radius: 10px;
          border-radius: 10px;
}

/*Media Queries*/

@media only screen and (max-width: 1023px) {
	body.masonry-page {
		background: #F5F5F5;
	}
}

/*For .site-inner width of 1140px, 4-columns*/
@media only screen and (max-width: 768px) {
	.masonry-page .content .entry {
		width: 325px;
	}
}
/*For .site-inner width of 1140px, 3-columns*/
@media only screen and (max-width: 768px) {
	.masonry-page .content .entry {
		width: 690px;
	}
}

@media only screen and (max-width: 480px) {
	.masonry-page .content .entry {
		width: 430px;
	}
}

@media only screen and (max-width: 320px) {
	.masonry-page .content .entry {
		width: 287px;
	}
}