Tweaked the h tag styling

source/less/Font/PTSerif-PTSans.less

@@ -30,7 +30,8 @@
 	}
 	.feature {
 		h1, h2, h3, h4, h5, h6 {
-			font-family: @font-serif;
+			font-family: @font-sans;
+			font-weight: 700;
 		}
 	}
 }

themes/font/PTSerif-PTSans.css

@@ -2,5 +2,5 @@
 .vmm-timeline .feature h1.date,.vmm-timeline .feature h2.date,.vmm-timeline .feature h3.date,.vmm-timeline .feature h4.date,.vmm-timeline .feature h5.date,.vmm-timeline .feature h6.date{font-family:'PT Sans',sans-serif !important;}
 .vmm-timeline .timenav h1,.vmm-timeline .flag-content h1,.vmm-timeline .era h1,.vmm-timeline .timenav h2,.vmm-timeline .flag-content h2,.vmm-timeline .era h2,.vmm-timeline .timenav h3,.vmm-timeline .flag-content h3,.vmm-timeline .era h3,.vmm-timeline .timenav h4,.vmm-timeline .flag-content h4,.vmm-timeline .era h4,.vmm-timeline .timenav h5,.vmm-timeline .flag-content h5,.vmm-timeline .era h5,.vmm-timeline .timenav h6,.vmm-timeline .flag-content h6,.vmm-timeline .era h6{font-family:'PT Sans',sans-serif !important;}
 .vmm-timeline p,.vmm-timeline blockquote,.vmm-timeline blockquote p,.vmm-timeline .twitter blockquote p{font-family:'PT Serif',serif !important;}
-.vmm-timeline .feature h1,.vmm-timeline .feature h2,.vmm-timeline .feature h3,.vmm-timeline .feature h4,.vmm-timeline .feature h5,.vmm-timeline .feature h6{font-family:'PT Serif',serif;}
+.vmm-timeline .feature h1,.vmm-timeline .feature h2,.vmm-timeline .feature h3,.vmm-timeline .feature h4,.vmm-timeline .feature h5,.vmm-timeline .feature h6{font-family:'PT Sans',sans-serif;font-weight:700;}
 .tooltip{font-family:'PT Sans',sans-serif;}