updated UI CSS

If materialize isn't available, it should at least provide some appearance. Otherwise, it also overrides its preferences too, which makes it easier when you build the extension.

gui/styles/ui.css

@@ -1,19 +1,88 @@
-/*
-ShopAI's GUI appearance
-*/
-
-.window-body {
-    display: flex;
-    flex-direction: column;
+:root {
+    --primary-color: rgba(255, 134, 57, 1);
+    --primary-color-raised-focus-solid: rgba(221, 106, 59, 1);
+    --primary-color-raised-hover-solid: rgba(252, 162, 133, 1);
 }
 
-.window-body .view_main {
-    flex-grow: 1;
-    min-width: 0;
+body:has(main.container) {
+    background: linear-gradient(
+        25deg,
+        rgba(221, 106, 59, 1) 0%,
+        rgba(255, 134, 57, 1) 62%,
+        rgba(252, 162, 133, 1) 100%
+    );
 }
 
-.window-body .action-buttons {
+main.container {
+    background-color: white;
+}
+
+.btn,
+.btn-floating {
+    background-color: var(--primary-color);
+}
+
+.btn:hover,
+.btn-floating:hover {
+    background-color: var(--primary-color-raised-hover-solid);
+}
+
+.btn:focus,
+.btn-floating:focus {
+    background-color: var(--primary-color-raised-focus-solid);
+}
+
+ul.sidenav-fixed + * {
+    padding-left: 300px;
+}
+
+@media only screen and (max-width: 992px) {
+    ul.sidenav-fixed + * {
+        padding-left: 0;
+    }
+}
+
+.collapsible > li > header {
+    font-weight: bold;
+}
+
+.dual {
+    height: 100%;
     display: flex;
-    align-items: end;
+    flex-direction: row;
+    justify-content: space-between;
+}
+
+form ul > li:has(input[type="checkbox"]),
+ul.input-field > li {
+    list-style-type: none;
+}
+
+form ul:has(li input[type="checkbox"]),
+ul.input-field {
+    padding-left: 0;
+}
+
+.input-group {
+    margin-block-start: 1em;
+    margin-block-end: 1em;
+}
+
+.input-group:not(:has(input)) {
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+}
+
+.input-group side:not(:has(input)) {
+    display: flex;
+    flex-direction: row;
     justify-content: end;
+    align-items: center;
+}
+
+.field-row {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
 }