section.post-size-thumbnail article,
section.post-size-medium article,
section.post-size-large article {
	width:calc(100%  - 20px);
}
section.post-size-thumbnail article {
	height:300px;
}
section.post-size-medium article {
	height:400px;
}
section.post-size-large article {
	height:500px;
}

@media(min-width:700px) {
	section.post-size-thumbnail article {
		width:calc(50%  - 20px);
	}
	section.post-size-medium article {
		width:calc(50%  - 20px);
		height:500px;
	}
}

@media(min-width:1000px) {
	section.post-size-thumbnail article {
		width:calc(100% / 3  - 20px);
		height:400px;
	}
	section.post-size-medium article {
		width:calc(100% / 3 - 20px);
	}
	section.post-size-large article {
		width:calc(50%  - 20px);
		height:600px;
	}
}