rename frontend directory

frontend/src/assets/main.css

@@ -0,0 +1,32 @@
+@import './base.css';
+
+*[hidden] { display: none !important; }
+
+a {
+  text-decoration: none;
+  color: var(--color-blue);
+  transition: 0.4s;
+  padding: 3px;
+}
+
+button {
+  color: inherit;
+  background-color: var(--color-background-soft);
+  border: 1px solid var(--color-border);
+  border-radius: var(--border-radius);
+}
+
+button {
+  border-color: var(--color-border-hover);
+}
+
+body {
+  display: flex;
+  direction: row;
+}
+
+main {
+  height: 100vh;
+  flex-grow: 1;
+  overflow: auto;
+}