diff --git a/main.py b/main.py
index ff4fc49..060980d 100644
--- a/main.py
+++ b/main.py
@@ -379,7 +379,7 @@ class App(QWidget):
         action_row.setSpacing(10)
 
         par_lbl = QLabel("Concurrent:")
-        par_lbl.setStyleSheet("font-size: 12px; font-weight: bold;")
+        par_lbl.setStyleSheet("font-size: 13px; font-weight: bold; color: #e2e8f0;")
         action_row.addWidget(par_lbl)
 
         self.parallel_spin = QSpinBox()
@@ -387,9 +387,13 @@ class App(QWidget):
         self.parallel_spin.setValue(10)
         self.parallel_spin.setSpecialValueText("∞")
         self.parallel_spin.setToolTip("0 = unlimited (all at once)")
-        self.parallel_spin.setFixedWidth(65)
-        self.parallel_spin.setFixedHeight(28)
-        self.parallel_spin.setStyleSheet("QSpinBox { font-size: 13px; font-weight: bold; }")
+        self.parallel_spin.setMinimumWidth(80)
+        self.parallel_spin.setFixedHeight(34)
+        self.parallel_spin.setStyleSheet(
+            "QSpinBox { font-size: 14px; font-weight: bold; color: #e2e8f0; "
+            "background-color: #2d3352; border: 1px solid #3d4a6b; border-radius: 6px; padding: 2px 6px; } "
+            "QSpinBox::up-button { width: 18px; } QSpinBox::down-button { width: 18px; }"
+        )
         action_row.addWidget(self.parallel_spin)
 
         self.btn_flash = QPushButton("⚡ FLASH SELECTED DEVICES")