GUI base navigation & home

theseus_gui/src/styles/normalize.postcss

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+@import 'sanitize.css';
+@import 'sanitize.css/forms.css';
+@import 'sanitize.css/typography.css';
+
+/* Overrides */
+
+button {
+	margin: 0;
+	padding: 0;
+	font-size: inherit;
+	box-shadow: none;
+	border: none;
+	cursor: pointer;
+}
+
+a {
+	color: inherit;
+	text-decoration: none;
+}
+
+*:focus {
+	outline: none;
+}
+
+button:focus-visible,
+a:focus-visible,
+[tabindex='0']:focus-visible {
+	outline: 0.2rem solid var(--color-brand);
+}
+
+html,
+body,
+#svelte {
+	height: 100%;
+}
+
+html {
+	overflow-y: hidden;
+	overflow-x: hidden;
+}
+
+h1,
+h2,
+h3,
+h4,
+h5,
+h6,
+p {
+	line-height: 100%;
+	margin: 0;
+}
+
+ul {
+  padding: 0 0 0 1.5rem;
+}