@media screen and (min-width: 640px) {
				.post-prev, .post-next{
				    position: fixed;
					top: 31%;
					opacity: 0.5;
					color: #fcfcfc;
					background-color: #0c0c0c;
					width: 32px;
					height: 33px;
					line-height: 82%;
					border-radius: 0%;
					font-size: 32px;
					text-align: center;
					z-index: 9999;
				}
				.post-next{
				    right: 0%;
				}
				.post-prev{
				    left: 0%;	
				}
				.post-prev:hover, div.post-next:hover{
				    opacity: 0.5;
				}
			}

			@media screen and (max-width: 640px) {
				.post-prev, .post-next{
				    position: fixed;
					top: 31%;
					opacity: 0.5;
					color: #0c0c0c;
					background-color: #ffffff;
					width: 31px;
					height: 30px;
					line-height: 95%;
					border-radius: 0%;
					font-size: 31px;
					text-align: center;
					z-index: 9999;
				}
				.post-next{
				    right: 0%;
				}
				.post-prev{
				    left: 0%;	
				}
				.post-prev:hover, .post-next:hover{
				    opacity: 0.5;
				}
			}