small ui improvements: added colour to buttons

scripts/simple_tab.py

 from PyQt6.QtWidgets import (QWidget, QVBoxLayout, QHBoxLayout, 
                              QGroupBox, QCheckBox, QMessageBox, QPushButton,
                              QProgressBar)
-from PyQt6.QtCore import Qt, QThread, pyqtSignal
+from PyQt6.QtCore import Qt, QThread, pyqtSignal, QTimer
 import os
 import sys
 
@@ -149,7 +149,10 @@ class SimpleTab(QWidget):
         self.depth.hide()
         self.material.hide()
         self.edge_net.hide()
-        
+
+        self.file_selected = False
+        self.flash_timer = QTimer(self)
+        self.flash_timer.timeout.connect(self.toggle_flash)
         self.setup_ui()
         
     def setup_ui(self):
@@ -165,15 +168,18 @@ class SimpleTab(QWidget):
             ("Status:", "Ready")
         ]
         self.info_group, self.info_labels = create_info_group("Information", info_rows)
+        self.info_group.setStyleSheet("QGroupBox { font-weight: bold; }")
         controls_layout.addWidget(self.info_group)
         
         # Options
         options_layout = QHBoxLayout()
         
         self.include_top_check = QCheckBox("Include Top in Mesh")
+        self.include_top_check.setStyleSheet("QCheckBox { margin: 5px; }")
         options_layout.addWidget(self.include_top_check)
         
         self.shift_image_check = QCheckBox("Shift Input Image")
+        self.shift_image_check.setStyleSheet("QCheckBox { margin: 5px; }")
         options_layout.addWidget(self.shift_image_check)
         
         controls_layout.addLayout(options_layout)
@@ -183,18 +189,44 @@ class SimpleTab(QWidget):
         self.progress_bar.setMinimum(0)
         self.progress_bar.setMaximum(0)  # Makes it an indefinite progress bar
         self.progress_bar.hide()  # Hidden by default
+        self.progress_bar.setStyleSheet("""
+            QProgressBar {
+                border: 2px solid grey;
+                border-radius: 5px;
+                text-align: center;
+            }
+            QProgressBar::chunk {
+                background-color: #05B8CC;
+                width: 20px;
+            }
+        """)
         controls_layout.addWidget(self.progress_bar)
         
         # Buttons
         self.run_pipeline_btn = QPushButton("Run Pipeline")
         self.run_pipeline_btn.clicked.connect(self.run_full_pipeline)
         self.run_pipeline_btn.setEnabled(False)  # Disabled by default
+        self.run_pipeline_btn.setStyleSheet("""
+            QPushButton {
+                margin: 5px;
+                padding: 5px;
+            }
+            QPushButton:enabled {
+                background-color: green;
+                color: white;
+            }
+            QPushButton:disabled {
+            background-color: red;
+            color: white;
+            }
+        """)
         
         buttons_layout = QHBoxLayout()
-        select_btn = QPushButton("Select Input Image")
-        select_btn.clicked.connect(self.handle_file_select)
+        self.select_btn = QPushButton("Select Input Image")
+        self.select_btn.clicked.connect(self.handle_file_select)
+        self.select_btn.setStyleSheet("QPushButton { margin: 5px; padding: 5px; }")
         
-        buttons_layout.addWidget(select_btn)
+        buttons_layout.addWidget(self.select_btn)
         buttons_layout.addWidget(self.run_pipeline_btn)
         controls_layout.addLayout(buttons_layout)
         
@@ -202,19 +234,56 @@ class SimpleTab(QWidget):
         
         # Status section
         status_group, self.status_text = create_group_with_text("Pipeline Status", 150)
+        status_group.setStyleSheet("""
+            QGroupBox {
+                font-weight: bold;
+                border: 2px solid grey;
+                border-radius: 5px;
+                margin-top: 10px;
+            }
+            QLabel {
+                margin: 5px;
+            }
+        """)
         layout.addWidget(status_group)
         
         # Preview section
         preview_group = QGroupBox("Preview")
+        preview_group.setStyleSheet("""
+            QGroupBox {
+                font-weight: bold;
+                border: 2px solid grey;
+                border-radius: 5px;
+                margin-top: 10px;
+            }
+        """)
         preview_layout = QHBoxLayout(preview_group)
         
         input_group, self.input_preview = create_preview_group("Input Image")
         output_group, self.output_preview = create_preview_group("Current Output")
-        
+        input_group.setStyleSheet("""
+            QGroupBox {
+                font-weight: bold;
+                border: 1px solid grey;
+                border-radius: 5px;
+                margin: 5px;
+            }
+        """)
+        output_group.setStyleSheet("""
+            QGroupBox {
+                font-weight: bold;
+                border: 1px solid grey;
+                border-radius: 5px;
+                margin: 5px;
+            }
+        """)
         preview_layout.addWidget(input_group)
         preview_layout.addWidget(output_group)
         layout.addWidget(preview_group)
 
+        # Start flashing if no file is selected
+        self.start_flashing()
+
     def handle_file_select(self):
         
         file_path = select_file(
@@ -239,6 +308,21 @@ class SimpleTab(QWidget):
             self.depth.depth_input_path = file_path
             self.material.input_file_path = file_path
             # self.edge_net.input_path = file_path # edgenet have default input path
+        
+        self.file_selected = True
+        self.flash_timer.stop()
+        self.select_btn.setStyleSheet("QPushButton { margin: 5px; padding: 5px; }")
+    
+    def start_flashing(self):
+        if not self.file_selected:
+            self.flash_timer.start(1000)  # Flash every 1000 milliseconds
+
+    def toggle_flash(self):
+        current_style = self.select_btn.styleSheet()
+        if "background-color: DarkOrange;" in current_style:
+            self.select_btn.setStyleSheet("QPushButton { margin: 5px; padding: 5px; }")
+        else:
+            self.select_btn.setStyleSheet("QPushButton { margin: 5px; padding: 5px; background-color: DarkOrange; }")
 
     def run_full_pipeline(self):
         if not self.input_path: