Add bottom margin to header slider

public/typo3conf/ext/ep_theme/Resources/Private/Partials/HeaderSlider.html

@@ -2,7 +2,7 @@
       xmlns="http://www.w3.org/1999/xhtml"
       xmlns:f="http://typo3.org/ns/fluid/ViewHelpers">
 
-    <div class="splide"
+    <div class="splide mb-8"
          data-controller="slider"
          data-slider-preset-value="header">
         <div class="splide__track">