add css to index.html;

index.html

@@ -9,13 +9,16 @@
       name="description"
       content="Aotearoa New Zealand National Seismic Hazard Model (NSHM), also known as Te Tauira Matapae Pūmate Rū i Aotearoa. The NSHM calculates the likelihood and strength of earthquake shaking that may occur in different parts of Aotearoa New Zealand over specified time periods."
     />
+    <link
+      rel="stylesheet"
+      href="https://cdn.jsdelivr.net/npm/[email protected]/dist/leaflet.timedimension.control.min.css"
+    />
     <link
       rel="stylesheet"
       href="https://unpkg.com/[email protected]/dist/leaflet.css"
       integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A=="
       crossorigin=""
     />
-
     <script
       src="https://unpkg.com/[email protected]/dist/leaflet.js"
       integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA=="