💄 style(css): update background color variable

- change background color from secondary-fixed to secondary-container for improved UI consistency

Author: isfopo

src/components/Section/ProjectsSection/index.module.css

@@ -10,7 +10,7 @@
       width: 90%;
       flex: 0 0 90%;
       user-select: none;
-      background: var(--md-sys-color-secondary-fixed);
+      background: var(--md-sys-color-secondary-container);
       padding: 1rem;
       border-radius: 1rem;
       text-decoration: none;