feat(style.css): add stylesheet

judas_server/web/static/css/style.css

@@ -0,0 +1,20 @@
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    background-color: #2e3440;
+    color: #eceff4;
+    padding: 1rem;
+}
+
+main {
+    padding: 2rem;
+    background-color: #eceff4;
+    color: #2e3440;
+}