move js and css to their own directories

css/poster.css

@@ -0,0 +1,33 @@
+
+body {
+    background: #434343;
+}
+
+aside {
+    background: url(../assets/notebook.jpg);
+    width: fit-content;
+}
+
+main {
+    overflow: hidden;
+    max-width: 21cm;
+    aspect-ratio: 1 / 1.414;
+    box-shadow: 5px 5px 5px #00000085;
+    margin: 50px auto;
+    position: relative;
+}
+
+@page {
+    size: portrait;
+    margin: 0;
+}
+
+@media print {
+    body main {
+        margin: 0 !important;
+    }
+
+    aside, footer, nav {
+        display: none;
+    }
+}