diff --git a/R/style.R b/R/style.R
index 1235984..4f1e610 100644
--- a/R/style.R
+++ b/R/style.R
@@ -3,15 +3,19 @@
 custom_css <- function() {
   tags$head(
     tags$style(HTML(
-      ".nav-hidden { height: 0 }",
       ".flow-layout > div {",
       "display: inline-block;",
       "vertical-align: top;",
       "margin-right: 12px;",
       "}",
-      ".shiny-input-container { width: auto !important; min-width: 200px; }",
       "h5 { margin-top: 0.5rem; margin-bottom: 1rem; font-weight: bold; }",
-      ".navbar-brand { font-weight: bold; }"
+      ".navbar-brand { font-weight: bold; }",
+      # Undo changes in Bootstrap theme:
+      ".nav-underline .nav-link { border-bottom: 0; }",
+      ".nav-underline .nav-link.active { font-weight: normal; }",
+      # Fix slider inputs floating above dropdown menu:
+      ".irs--shiny .irs-bar { z-index: 1; }",
+      ".irs--shiny .irs-handle { z-index: 1; }"
     ))
   )
 }