Standardize font sizes (#46)

Closes #33.

There were many more font sizes in the Figma, but as a best design practice, I chose the four most common.

Staging:

https://j285he-standardize-font-sizes-csc-class-prof-snedadah.k8s.csclub.cloud/
Co-authored-by: Jared He <66887902+jaredjhe@users.noreply.github.com>
Co-authored-by: shahanneda <shahan.neda@gmail.com>
Reviewed-on: #46
Reviewed-by: Amy <a258wang@csclub.uwaterloo.ca>

pages/_app.css

@@ -69,22 +69,52 @@ body {
   color: var(--primary-text);
   font-family: "Inconsolata", monospace;
   margin: 0;
+
+  /* Font styling for body */
+  font-size: calc(18rem / 16);
+  font-weight: 500;
+}
+
+/* Page titles (e.g. Demographics) */
+h1 {
+  font-size: calc(48rem / 16);
+  font-weight: 700;
+  color: var(--primary-accent-light);
+  margin-top: calc(32rem / 16);
+  margin-bottom: calc(16rem / 16);
 }
 
-h1,
+/* Major section headings (e.g. About the Programs) */
 h2 {
+  font-size: calc(36rem / 16);
+  font-weight: 700;
   color: var(--primary-heading);
+  margin-top: calc(32rem / 16);
+  margin-bottom: calc(16rem / 16);
 }
 
+/* Minor section headings & questions (e.g. What Program Are You In?) */
 h3 {
+  font-size: calc(32rem / 16);
+  font-weight: 700;
   color: var(--secondary-heading);
-  font-size: calc(45rem / 16);
+  margin-top: calc(24rem / 16);
+  margin-bottom: calc(16rem / 16);
 }
 
-h4,
-h5,
-h6 {
+/* Titles within paragraphs (e.g. About the Programs -> Computer Science)*/
+h4 {
+  font-size: calc(24rem / 16);
+  font-weight: 700;
   color: var(--secondary-heading);
+  margin-top: calc(24rem / 16);
+  margin-bottom: calc(8rem / 16);
+}
+
+p {
+  color: var(--primary-text);
+  margin-top: 1rem;
+  margin-bottom: 1rem;
 }
 
 a {
@@ -96,10 +126,6 @@ a:hover {
   color: var(--link-hover);
 }
 
-p {
-  font-size: calc(28rem / 16);
-}
-
 @media only screen and (prefers-color-scheme: dark) {
   body {
     --primary-background: var(--dark--primary-background);

pages/playground.tsx

@@ -31,6 +31,16 @@ export default function Home() {
         <PieChart data={mockPieData} width={800} labelWidth={215} />
       </div>
       <ColorPalette />
+      <h2>
+        <code>Text Styles</code>
+      </h2>
+      <h1>h1 h1 h1 h1 h1 h1 h1 h1 h1 h1 h1 h1 h1 h1 h1 h1 h1 h1</h1>
+      <h2>h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2</h2>
+      <h3>h3 h3 h3 h3 h3 h3 h3 h3 h3 h3 h3 h3 h3 h3 h3 h3 h3 h3</h3>
+      <h4>h4 h4 h4 h4 h4 h4 h4 h4 h4 h4 h4 h4 h4 h4 h4 h4 h4 h4</h4>
+      <p>p p p p p p p p p p p p p p p p p p p p p p p p p p p p</p>
+      <a href="#">a a a a a a a a a a a a a a a a a a a a a a a a a a a a</a>
+
       <h2>
         <code>{"<BarGraphHorizontal />"}</code>
       </h2>