feat(grfn/bbbg): Begin styles

Start working on styles for the app, beginning with a global
stylesheet/reset and styles for the nav.

Change-Id: Ie15e549d7bb4e0116582f4099752aa2503eb9ce7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4583
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

users/grfn/bbbg/resources/base.css

@@ -0,0 +1,152 @@
+/* montserrat-italic - latin */
+@font-face {
+  font-family: "Montserrat";
+  font-style: italic;
+  font-weight: 400;
+  src: local("Montserrat Italic"), local("Montserrat-Italic"),
+    url("/fonts/montserrat-v15-latin-italic.woff2") format("woff2"),
+    /* Chrome 26+, Opera 23+, Firefox 39+ */
+      url("/fonts/montserrat-v15-latin-italic.woff") format("woff"); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
+}
+
+/* montserrat-regular - latin */
+@font-face {
+  font-family: "Montserrat";
+  font-style: normal;
+  font-weight: 400;
+  src: local("Montserrat Regular"), local("Montserrat-Regular"),
+    url("/fonts/montserrat-v15-latin-regular.woff2") format("woff2"),
+    /* Chrome 26+, Opera 23+, Firefox 39+ */
+      url("/fonts/montserrat-v15-latin-regular.woff") format("woff"); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
+}
+
+/* montserrat-500 - latin */
+@font-face {
+  font-family: "Montserrat";
+  font-style: normal;
+  font-weight: 500;
+  src: local("Montserrat Medium"), local("Montserrat-Medium"),
+    url("/fonts/montserrat-v15-latin-500.woff2") format("woff2"),
+    /* Chrome 26+, Opera 23+, Firefox 39+ */
+      url("/fonts/montserrat-v15-latin-500.woff") format("woff"); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
+}
+
+/* montserrat-500italic - latin */
+@font-face {
+  font-family: "Montserrat";
+  font-style: italic;
+  font-weight: 500;
+  src: local("Montserrat Medium Italic"), local("Montserrat-MediumItalic"),
+    url("/fonts/montserrat-v15-latin-500italic.woff2") format("woff2"),
+    /* Chrome 26+, Opera 23+, Firefox 39+ */
+      url("/fonts/montserrat-v15-latin-500italic.woff") format("woff"); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
+}
+
+/* montserrat-600 - latin */
+@font-face {
+  font-family: "Montserrat";
+  font-style: normal;
+  font-weight: 600;
+  src: local("Montserrat SemiBold"), local("Montserrat-SemiBold"),
+    url("/fonts/montserrat-v15-latin-600.woff2") format("woff2"),
+    /* Chrome 26+, Opera 23+, Firefox 39+ */
+      url("/fonts/montserrat-v15-latin-600.woff") format("woff"); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
+}
+
+/* montserrat-800 - latin */
+@font-face {
+  font-family: "Montserrat";
+  font-style: normal;
+  font-weight: 800;
+  src: local("Montserrat ExtraBold"), local("Montserrat-ExtraBold"),
+    url("/fonts/montserrat-v15-latin-800.woff2") format("woff2"),
+    /* Chrome 26+, Opera 23+, Firefox 39+ */
+      url("/fonts/montserrat-v15-latin-800.woff") format("woff"); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
+}
+
+/* montserrat-800italic - latin */
+@font-face {
+  font-family: "Montserrat";
+  font-style: italic;
+  font-weight: 800;
+  src: local("Montserrat ExtraBold Italic"), local("Montserrat-ExtraBoldItalic"),
+    url("/fonts/montserrat-v15-latin-800italic.woff2") format("woff2"),
+    /* Chrome 26+, Opera 23+, Firefox 39+ */
+      url("/fonts/montserrat-v15-latin-800italic.woff") format("woff"); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
+}
+
+body {
+  width: 100%;
+  font-family: "Montserrat", Helvetica, sans-serif;
+  margin: 0;
+  box-sizing: border-box;
+}
+
+*,
+::before,
+::after {
+  box-sizing: border-box;
+}
+
+ul,
+ol {
+  padding: 0;
+}
+
+body,
+h1,
+h2,
+h3,
+h4,
+p,
+ul,
+ol,
+li,
+figure,
+figcaption,
+blockquote,
+dl,
+dd {
+  margin: 0;
+}
+
+body {
+  min-height: 100vh;
+  scroll-behavior: smooth;
+  text-rendering: optimizeSpeed;
+  line-height: 1.5;
+}
+
+ul[class],
+ol[class] {
+  list-style: none;
+}
+
+a:not([class]) {
+  text-decoration-skip-ink: auto;
+}
+
+img {
+  max-width: 100%;
+  display: block;
+}
+
+article > * + * {
+  margin-top: 1em;
+}
+
+input,
+button,
+textarea,
+select {
+  font: inherit;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  * {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
+    scroll-behavior: auto !important;
+  }
+}