add

src/css/base/list/clusterize.css

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+/* max-height - the only parameter in this file that needs to be edited.
+ * Change it to suit your needs. The rest is recommended to leave as is.
+ */
+.clusterize-scroll {
+  overflow: auto;
+}
+/**
+ * Avoid vertical margins for extra tags
+ * Necessary for correct calculations when rows have nonzero vertical margins
+ */
+.clusterize-extra-row {
+  margin-top: 0 !important;
+  margin-bottom: 0 !important;
+}
+/* By default extra tag .clusterize-keep-parity added to keep parity of rows.
+ * Useful when used :nth-child(even/odd)
+ */
+.clusterize-extra-row.clusterize-keep-parity {
+  display: none;
+}
+/* During initialization clusterize adds tabindex to force the browser to keep focus
+ * on the scrolling list, see issue #11
+ * Outline removes default browser's borders for focused elements.
+ */
+.clusterize-content {
+  outline: 0;
+}
+/* Centering message that appears when no data provided
+ */
+.clusterize-no-data td {
+  text-align: center;
+}