diff --git a/src/components/Popover/Popover.module.scss b/src/components/Popover/Popover.module.scss
index b4a746bb..115eb1e8 100644
--- a/src/components/Popover/Popover.module.scss
+++ b/src/components/Popover/Popover.module.scss
@@ -68,19 +68,19 @@
 
     // Arrows
     .isRootAtTop > .arrow {
-        top: 100%;
+        top: calc(100% - 1px);
     }
 
     .isRootAtBottom > .arrow {
-        bottom: 100%;
+        bottom: calc(100% - 1px);
     }
 
     .isRootAtLeft > .arrow {
-        left: 100%;
+        left: calc(100% - 1px);
     }
 
     .isRootAtRight > .arrow {
-        right: 100%;
+        right: calc(100% - 1px);
     }
 
     // Side alignments: top
diff --git a/src/components/Popover/_theme.scss b/src/components/Popover/_theme.scss
index bb3523cb..696f5306 100644
--- a/src/components/Popover/_theme.scss
+++ b/src/components/Popover/_theme.scss
@@ -11,6 +11,7 @@ $color: var(--rui-Popover__color);
 $background-color: var(--rui-Popover__background-color);
 $box-shadow: var(--rui-Popover__box-shadow);
 
-$arrow-width: 1rem;
+// 1 rem (16px) + 2px (for insetting the arrow)
+$arrow-width: 18px;
 $arrow-height: math.div($arrow-width, 2); // 1.
 $arrow-corner-offset: 0.75rem;