Copy and paste of portfolio archive page css.

portfolio.css

.genesis-pro-portfolio .pro-portfolio {
	-webkit-box-sizing: border-box;
	-moz-box-sizing:    border-box;
	box-sizing:         border-box;
	float: left;
	margin-left: 0;
	margin-right: 2%;
	padding: 15px;
	padding: 1.5rem;
	width: 32%;
}

.genesis-pro-portfolio .pro-portfolio:nth-of-type(3n+1) {
    clear: left;
}

.genesis-pro-portfolio .pro-portfolio:nth-of-type(3n+3) {
    margin-right: 0;
}

.genesis-pro-portfolio .archive-pagination {
    clear: both;
}

.genesis-pro-portfolio .pro-portfolio .entry-header .entry-title {
	border: none;
	font-size: 20px;
	margin: 20px 0 0;
	padding: 0;
}

.genesis-pro-portfolio .content .pro-portfolio {
	border: none;
	margin-bottom: 40px;
	text-align: center;
	background-image: none;
}

.genesis-pro-portfolio .content .entry-header {
	border: medium none;
	margin: 0;
	padding: 0;
}

.genesis-pro-portfolio .content .entry-content {
	margin: 0;
	padding: 0;
}

.genesis-pro-portfolio .pro-portfolio .entry-header .entry-title {
	word-wrap: break-word;
	border: none;
	font-size: 20px;
	margin: 20px 0 0;
	padding: 0;
}

.genesis-pro-portfolio .entry-header .entry-meta {
    font-weight: normal;
    font-size: 16px;
    margin: 0;
    padding: 5px;
    text-transform: none;
}

.genesis-pro-portfolio .content .entry-header .entry-meta .entry-comments-link {
    display: block;
    float: none;
    margin-top: 5px;
    padding-bottom: 0;
}

.genesis-pro-portfolio .entry-author,
.genesis-pro-portfolio .entry-comments-link,
.genesis-pro-portfolio .entry-time {
    border-width: 0;
    float: none;
    margin: 0;
    width: auto;
}

.genesis-pro-portfolio .entry-author:before,
.genesis-pro-portfolio .entry-comments-link:before,
.entry-time:before {
    content: "";
}

.genesis-pro-portfolio .pro-portfolio .entry-header .entry-title {
    margin: 20px 0 10px;
}

.genesis-pro-portfolio .entry-header .entry-meta {
    line-height: 1.6;
}

.genesis-pro-portfolio .entry-comments-link:before {
    display: none;
}

.genesis-pro-portfolio .content .entry-header .entry-meta .entry-comments-link a {
    background-image: none;
    display: block;
    padding: 5px 8px;
    position: static;
}

@media only screen and (max-width: 780px) {

	.genesis-pro-portfolio .pro-portfolio {
		width: 100%;
	}

}