Update app.py

app.py

@@ -1,21 +1,59 @@
 import streamlit as st
 import math
 
-# App title
-st.title("Pipe Sizing Helper")
-st.write("This app suggests pipe sizes for a given flow rate and permissible velocity.")
+# Set page config with an icon and title
+st.set_page_config(page_title="Pipe Sizing Helper", page_icon="🛠️")
+
+# Custom style
+st.markdown(
+    """
+    <style>
+    .title {
+        font-size: 2.5rem;
+        color: #4CAF50;
+        font-weight: bold;
+    }
+    .subtitle {
+        font-size: 1.25rem;
+        color: #333;
+    }
+    .stButton>button {
+        background-color: #4CAF50;
+        color: white;
+        border-radius: 8px;
+        padding: 10px 20px;
+        font-size: 1rem;
+    }
+    </style>
+    """,
+    unsafe_allow_html=True,
+)
+
+# App header
+st.markdown('<div class="title">Pipe Sizing Helper</div>', unsafe_allow_html=True)
+st.markdown(
+    '<div class="subtitle">Get recommendations for pipe sizes based on flow rate and permissible velocity.</div>',
+    unsafe_allow_html=True,
+)
+
+# App layout
+st.image(
+    "https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Pipe_icon.svg/1024px-Pipe_icon.svg.png",
+    width=100,
+)  # Add an icon image
+st.divider()
 
 # Input fields
-flow_rate = st.number_input("Enter Flow Rate (m³/s):", min_value=0.0, step=0.01)
-velocity = st.number_input("Enter Permissible Velocity (m/s):", min_value=0.1, step=0.01)
+st.header("Input Parameters")
+flow_rate = st.number_input("Flow Rate (m³/s):", min_value=0.0, step=0.01, value=0.0)
+velocity = st.number_input("Permissible Velocity (m/s):", min_value=0.1, step=0.01, value=0.1)
 
-# Calculate pipe diameter
-if st.button("Calculate"):
+# Calculate pipe diameter when button is clicked
+if st.button("Generate Recommended Pipe Diameter"):
     if velocity > 0:
         # Pipe diameter formula: D = sqrt(4 * Q / (π * V))
         diameter = math.sqrt((4 * flow_rate) / (math.pi * velocity))
         diameter_mm = diameter * 1000  # Convert meters to mm
         st.success(f"Recommended Pipe Diameter: {diameter_mm:.2f} mm")
     else:
-        st.error("Velocity must be greater than zero.")
-
+        st.error("Permissible velocity must be greater than zero.")