diff --git a/pulse-ui/src/layout.rs b/pulse-ui/src/layout.rs
index ca37247..9209c9d 100644
--- a/pulse-ui/src/layout.rs
+++ b/pulse-ui/src/layout.rs
@@ -26,23 +26,54 @@ impl LayoutItem {
 
                 let allocation = if is_row { alloc.height } else { alloc.width };
 
-                let remaining = allocation
-                    - items
-                        .iter()
-                        .map(|item| item.get_size().get_fixed(allocation))
-                        .sum::<u16>();
+                let fixed_total: u16 = items
+                    .iter()
+                    .map(|item| item.get_size().get_fixed(allocation))
+                    .sum();
+
+                let remaining = allocation.saturating_sub(fixed_total);
 
                 let total_weight = items
                     .iter()
                     .map(|item| item.get_size().get_flex())
                     .sum::<u16>();
 
+                let base_allocs: Vec<u16> = items
+                    .iter()
+                    .map(|item| item.get_size().get(allocation, remaining, total_weight))
+                    .collect();
+
+                let flex_alloc_total: u16 = items
+                    .iter()
+                    .zip(base_allocs.iter())
+                    .filter(|(item, _)| item.get_size().get_flex() > 0)
+                    .map(|(_, a)| a)
+                    .sum();
+
+                let gap = remaining.saturating_sub(flex_alloc_total);
+
+                let fill_count = items
+                    .iter()
+                    .filter(|item| item.get_size().is_fill())
+                    .count() as u16;
+
+                let gap_per_fill = if fill_count > 0 { gap / fill_count } else { 0 };
+                let gap_remainder = if fill_count > 0 { gap % fill_count } else { 0 };
+
                 let mut curr = if is_row { alloc.y } else { alloc.x };
+                let mut fill_idx = 0u16;
 
-                for item in items {
+                for (i, item) in items.iter().enumerate() {
                     let size = item.get_size();
+                    let mut unit_alloc = base_allocs[i];
 
-                    let unit_alloc = size.get(allocation, remaining, total_weight);
+                    if size.is_fill() {
+                        unit_alloc += gap_per_fill;
+                        if fill_idx == 0 {
+                            unit_alloc += gap_remainder;
+                        }
+                        fill_idx += 1;
+                    }
 
                     let item_alloc = if is_row {
                         Rect {
diff --git a/pulse-ui/src/unit.rs b/pulse-ui/src/unit.rs
index 83ff31d..c21b503 100644
--- a/pulse-ui/src/unit.rs
+++ b/pulse-ui/src/unit.rs
@@ -9,6 +9,7 @@ pub enum Size {
     Fixed(u16),
     Flex(u16),
     Percent(u16),
+    Fill,
 }
 
 #[derive(Debug, Clone, Copy)]
@@ -20,17 +21,22 @@ pub struct Rect {
 }
 
 impl Size {
+    pub fn is_fill(&self) -> bool {
+        matches!(self, Self::Fill)
+    }
+
     pub fn get_fixed(&self, alloc: u16) -> u16 {
         match self {
             Self::Fixed(v) => *v,
             Self::Percent(v) => alloc * (*v) / 100,
-            Self::Flex(_) => 0,
+            Self::Flex(_) | Self::Fill => 0,
         }
     }
 
     pub fn get_flex(&self) -> u16 {
         match self {
             Self::Flex(f) => *f,
+            Self::Fill => 1,
             _ => 0,
         }
     }
@@ -46,6 +52,13 @@ impl Size {
                     remaining * v / total_weight
                 }
             }
+            Self::Fill => {
+                if total_weight == 0 {
+                    0
+                } else {
+                    remaining / total_weight
+                }
+            }
         }
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 6577301..2b1de93 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -111,7 +111,7 @@ impl App for PulseTradeApp {
                 LayoutItem::Widget(Size::Flex(1)),
                 // Event logs
                 LayoutItem::Spacing(Size::Fixed(1)),
-                LayoutItem::Widget(Size::Flex(1)),
+                LayoutItem::Widget(Size::Fill),
                 // Input
                 LayoutItem::Spacing(Size::Fixed(1)),
                 LayoutItem::Widget(Size::Fixed(1)),