Improve styles.

src/App.vue

@@ -22,8 +22,52 @@ export default {
 </script>
 
 <style>
+:root {
+  --text-color: #003049;
+  --secondary-text-color: #eae2b7;
+  --theme-color: #003049;
+  --background-color: #eae2b7;
+  --secondary-background: #d62828;
+  background-color: var(--background-color);
+  color: var(--text-color);
+}
+
 * {
   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
     Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
 }
+
+.shortcuthelp {
+  position: absolute;
+  right: 0;
+  top: 0;
+  color: var(--background-color);
+  background-color: var(--theme-color);
+  padding: 0.5rem;
+  margin: 1rem 1rem 0 0;
+}
+
+@media (max-width: 450px) {
+  .shortcuthelp {
+    display: none;
+  }
+}
+
+ul {
+  margin: 0;
+  padding: 0;
+}
+
+li {
+  list-style-type: none;
+  color: var(--background-color);
+}
+
+kbd {
+  background-color: var(--secondary-background);
+  color: var(--secondary-text-color);
+  display: inline-block;
+  padding: 0.1rem;
+  margin: 0.1rem 0.5rem;
+}
 </style>

src/components/NoteList.vue

@@ -86,34 +86,38 @@ export default {
 </script>
 
 <style scoped>
+@media (min-width: 575px) {
+  .note {
+    width: 550px;
+  }
+}
+
 textarea {
   width: 100%;
-  border-width: 0 0 1px 0;
-  border-color: black;
+  border-width: 0 0 0.1rem 0;
+  border-color: var(--theme-color);
   resize: none;
+  background-color: var(--background-color);
+  margin-bottom: 1rem;
 }
 
 .note {
-  border-width: 1px;
-  padding: 5px;
-  margin-bottom: 5px;
+  padding: 0.5rem;
+  margin-bottom: 0.5rem;
+  border: 0.1rem solid transparent;
+  max-width: 550px;
 }
 
 .selected {
-  border-style: dashed;
-  border-width: 1px;
+  border: 0.1rem dashed var(--theme-color);
 }
 
 .noteid {
-  background-color: slateblue;
-  color: white;
-  border-radius: 5px;
-  margin-right: 5px;
-  margin-bottom: 2px;
-  padding: 1px 15px;
-  font-size: 0.7rem;
-  display: block;
-  width: 15px;
-  font-family: monospace;
+  background-color: var(--theme-color);
+  color: var(--secondary-text-color);
+  padding: 0 0.5rem;
+  display: inline-block;
+  width: 5rem;
+  margin-right: 0.5rem;
 }
 </style>