diff --git a/core/ui/src/main/java/com/sadellie/unitto/core/ui/theme/Type.kt b/core/ui/src/main/java/com/sadellie/unitto/core/ui/theme/Type.kt
index 5fa08f65..0b9ffc74 100644
--- a/core/ui/src/main/java/com/sadellie/unitto/core/ui/theme/Type.kt
+++ b/core/ui/src/main/java/com/sadellie/unitto/core/ui/theme/Type.kt
@@ -68,8 +68,8 @@ val NumbersTextStyleTitleLarge = TextStyle(
 val NumbersTextStyleTitleSmall = TextStyle(
     fontFamily = Lato,
     fontWeight = FontWeight.W500,
-    fontSize = 14.sp,
-    lineHeight = 20.sp,
+    fontSize = 20.sp,
+    lineHeight = 24.sp,
     letterSpacing = 0.sp,
 )
 
diff --git a/feature/calculator/src/main/java/com/sadellie/unitto/feature/calculator/components/CalculatorKeyboard.kt b/feature/calculator/src/main/java/com/sadellie/unitto/feature/calculator/components/CalculatorKeyboard.kt
index 69ec035b..579adf1e 100644
--- a/feature/calculator/src/main/java/com/sadellie/unitto/feature/calculator/components/CalculatorKeyboard.kt
+++ b/feature/calculator/src/main/java/com/sadellie/unitto/feature/calculator/components/CalculatorKeyboard.kt
@@ -31,6 +31,8 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ExpandLess
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.IconButtonDefaults
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -128,7 +130,10 @@ internal fun CalculatorKeyboard(
                 }
             }
             // Expand/Collapse
-            IconButton({ showAdditional = !showAdditional }) {
+            IconButton(
+                onClick = { showAdditional = !showAdditional },
+                colors = IconButtonDefaults.iconButtonColors(containerColor = MaterialTheme.colorScheme.inverseOnSurface,)
+            ) {
                 Icon(Icons.Default.ExpandLess, null, Modifier.rotate(expandRotation))
             }
         }