Moved styles to a global.css stylesheet. Also added basic validation with a transition

Jellyfin.Plugin.MediaCleaner/Pages/global.css

@@ -0,0 +1,50 @@
+table {
+    border: 1px solid;
+    border-collapse: collapse;
+}
+
+td, th {
+    border: 1px solid;
+    padding: 0.5rem 0.75rem;
+    text-align: left;
+}
+
+.links {
+    background-color: #0f0f0f;
+    border: 1px solid;
+    padding: 0.8rem 1.8rem;
+    font-size: 1.2rem;
+    color: #ffffff;
+    text-decoration: none;
+    cursor: pointer;
+    line-height: inherit;
+    vertical-align: baseline;
+    transition: background-color 0.3s ease;
+}
+
+.links:hover {
+  background-color: #2a2a2a;
+}
+
+.actions-cell {
+    text-align: center;
+}
+
+.validation {
+  border: 1px solid;
+  border-radius: 0.25rem;
+  padding: 1rem;
+  opacity: 1;
+}
+
+.medium-width {
+    width: 50%;
+}
+
+.small-width {
+    width: 20%;
+}
+
+.xsmall-width {
+    width: 10%;
+}