Display Blog Posts in Grid on Blog Page Genesis without a Plugin

style.css

/* Create a page called Blog.
Go to Layout Settings. Add the word "blog" (without quotes) to the Custom Body Class, then Save.
Add the following code to the stylesheet or to the Additional CSS Box.
*/

/* Blog Page Grid Layout
-----------------------------------------------------*/
.blog .content .entry {
    border:0;
    float:left;
    margin-bottom:30px;
    width:50%;
}

.blog .content .entry:nth-of-type(odd) {
    padding-right: 15px;
}

.blog .content .entry:nth-of-type(even) {
    padding-left: 15px;
}

.blog .content .entry:nth-of-type(2n) {
    float: right;
}

.blog .content .entry:nth-child(2n+1) {
    clear:both;
}

.blog .content .entry-title {
	font-size:30px;
	margin:0 auto 25px;
	padding:0;
}

@media only screen and (max-width : 480px) {
.blog .content .entry {
    border:0;
    float:left;
    margin-bottom:30px;
    width:100%;
}
}