Simplify frontend

Just a login form and a list of applications. No modals or anything like
that.

src/browser/pages/global.css

@@ -0,0 +1,27 @@
+html,
+body,
+#root,
+.center-container {
+  height: 100%;
+  width: 100%;
+}
+
+body {
+  background: #272727;
+  color: #f4f4f4;
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  overflow: hidden;
+}
+
+button {
+  font-family: inherit;
+}
+
+.center-container {
+  align-items: center;
+  box-sizing: border-box;
+  display: flex;
+  justify-content: center;
+  padding: 20px;
+}