fix: 2px misalignment

feat: Improved readability of tabs and subheadings

app/components/Subheading.js

@@ -1,16 +1,37 @@
 // @flow
+import * as React from 'react';
 import styled from 'styled-components';
 
-const Subheading = styled.h3`
-  font-size: 11px;
-  font-weight: 500;
-  text-transform: uppercase;
-  letter-spacing: 0.04em;
-  color: ${props => props.theme.textTertiary};
+type Props = {
+  children: React.Node,
+};
+
+const H3 = styled.h3`
   border-bottom: 1px solid ${props => props.theme.divider};
-  padding-bottom: 8px;
-  margin-top: 30px;
-  margin-bottom: 10px;
+  margin-top: 22px;
+  margin-bottom: 12px;
+  line-height: 1;
 `;
 
+const Underline = styled('span')`
+  position: relative;
+  top: 1px;
+
+  display: inline-block;
+  font-weight: 500;
+  font-size: 14px;
+  line-height: 1.5;
+  color: ${props => props.theme.textSecondary};
+  border-bottom: 3px solid ${props => props.theme.textSecondary};
+  padding-bottom: 5px;
+`;
+
+const Subheading = ({ children, ...rest }: Props) => {
+  return (
+    <H3 {...rest}>
+      <Underline>{children}</Underline>
+    </H3>
+  );
+};
+
 export default Subheading;