diff --git a/app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt b/app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt
index 74743cd..e2c31f1 100644
--- a/app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt
+++ b/app/src/main/java/com/mirenkov/ktheightmap/MainActivity.kt
@@ -11,6 +11,7 @@ import androidx.compose.foundation.gestures.Orientation
 import androidx.compose.foundation.gestures.detectDragGestures
 import androidx.compose.foundation.gestures.draggable
 import androidx.compose.foundation.gestures.rememberDraggableState
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.safeDrawingPadding
@@ -18,6 +19,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Build
 import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.MaterialTheme.colorScheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
@@ -25,6 +27,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.geometry.Size
@@ -106,14 +109,6 @@ fun MapCanvas(
     }
 }
 
-@Composable
-fun Greeting(name: String, modifier: Modifier = Modifier) {
-    Text(
-        text = "Hello $name!",
-        modifier = modifier
-    )
-}
-
 @Composable
 fun ToolButton() {
     FloatingActionButton(
@@ -125,16 +120,21 @@ fun ToolButton() {
 
 @Preview(showBackground = true)
 @Composable
-fun GreetingPreview() {
+fun MainPreview() {
     KtHeightMapTheme {
-        Greeting("Android")
-    }
-}
-
-@Preview(showBackground = true)
-@Composable
-fun ToolButtonPreview() {
-    KtHeightMapTheme {
-        ToolButton()
+        Scaffold(
+            modifier = Modifier.safeDrawingPadding(),
+            floatingActionButton = { ToolButton() }
+        ) { innerPadding ->
+            Box(
+                modifier = Modifier.padding(innerPadding)
+                    .fillMaxSize(),
+                contentAlignment = Alignment.Center
+            ) {
+                Text(
+                    text = "Gryadki"
+                )
+            }
+        }
     }
 }
\ No newline at end of file