Default screen with cards on it working

Set/AspectVGrid.swift

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+//
+//  AspectVGrid.swift
+//  Memorize
+//
+//  Created by Oliver Hnát on 08.04.2023.
+//
+
+import SwiftUI
+
+    struct AspectVGrid<Item, ItemView>: View where ItemView: View, Item: Identifiable {
+    var items: [Item]
+    var aspectRatio: CGFloat
+    var content: (Item) -> ItemView
+    
+    init(items: [Item], aspectRatio: CGFloat, @ViewBuilder content: @escaping (Item) -> ItemView) {
+        self.items = items
+        self.aspectRatio = aspectRatio
+        self.content = content
+    }
+    
+    var body: some View {
+        GeometryReader { geometry in
+            VStack {
+                let width: CGFloat = widthThatFits(itemCount: items.count, in: geometry.size, itemAspectRatio: aspectRatio)
+                LazyVGrid(columns: [adaptiveGridItem(width: width)], spacing: 0) {
+                    ForEach(items) { item in
+                        content(item).aspectRatio(aspectRatio, contentMode: .fit)
+                    }
+                }
+                Spacer(minLength: 0)
+            }
+        }
+    }
+    
+    private func adaptiveGridItem(width: CGFloat) -> GridItem {
+        var gridItem = GridItem(.adaptive(minimum: width))
+        gridItem.spacing = 0
+        return gridItem
+    }
+    
+    private func widthThatFits(itemCount: Int, in size: CGSize, itemAspectRatio: CGFloat) -> CGFloat {
+        var columnCount = 1
+        var rowCount = itemCount
+        repeat {
+            let itemWidth = size.width / CGFloat(columnCount)
+            let itemHeight = itemWidth / itemAspectRatio
+            if CGFloat(rowCount) * itemHeight < size.height {
+                break
+            }
+            columnCount += 1
+            rowCount = (itemCount + (columnCount-1)) / columnCount
+        } while columnCount < itemCount
+        if columnCount > itemCount {
+            columnCount = itemCount
+        }
+        return floor(size.width / CGFloat(columnCount))
+    }
+}
+
+//struct AspectVGrid_Previews: PreviewProvider {
+//    static var previews: some View {
+//        AspectVGrid()
+//    }
+//}