Please add CSS and other Aesthetics for my app.py code below:

import streamlit as st

import requests

from streamlit$\_$folium import folium$\_$static

import folium

import plotly.graph$\_$objs as go

api$\_$key $=$ "YOUR$\_$API$\_$KEY$\_$HERE"

st$.$title$("$Weather and Air Quality Web App"$)$

st$.$header$("$Streamlit and AirVisual API"$)$

@st$.$cache$\_$data

def generate$\_$list$\_$of$\_$countries$()$:

countries$\_$url $=$ "YOUR$\_$API$\_$KEY$\_$HERE"

countries$\_$dict $=$ requests.get$($countries$\_$url$).$json$()$

return countries$\_$dict

@st$.$cache$\_$data

def generate$\_$list$\_$of$\_$states$($country$\_$selected$)$:

states$\_$url $=$"YOUR$\_$API$\_$KEY$\_$HERE"

states$\_$dict $=$ requests.get$($states$\_$url$).$json$()$

return states$\_$dict

@st$.$cache$\_$data

def generate$\_$list$\_$of$\_$cities$($state$\_$selected, country$\_$selected$)$:

cities$\_$url $=$"YOUR$\_$API$\_$KEY$\_$HERE"

cities$\_$dict $=$ requests.get$($cities$\_$url$).$json$()$

return cities$\_$dict

def display$\_$data$($data$)$:

st$.$write$("**$Temperature:$**",$ data$["$current$"]["$weather$"]["$tp$"],"\backslash$deg C$")$

st$.$write$("**$Humidity:$**",$ data$["$current$"]["$weather$"]["$hu$"],"\%")$

st$.$write$("**$Air Quality Index $($AQI$)$:$**",$ data$["$current$"]["$pollution$"]["$aqius$"])$

def map$\_$creator$($latitude$,$ longitude$)$:

m $=$ folium.Map$($location$=[$latitude$,$ longitude$],$ zoom$\_$start$=10)$

folium.Marker$([$latitude$,$ longitude$],$ popup$=$"Location", tooltip$=$"Location"$).$add$\_$to$($m$)$

folium$\_$static$($m$)$

category $=$ st$.$selectbox$("$Select location method", $["$By City, State, and Country", $"$By Nearest City $($IP Address$)","$By Latitude and Longitude"$])$

if category $=="$By City, State, and Country":

countries$\_$dict $=$ generate$\_$list$\_$of$\_$countries$()$

if countries$\_$dict$["$status$"]==$ "success":

countries$\_$list $=[$i$["$country$"]$ for i in countries$\_$dict$["$data$"]]$

countries$\_$list.insert$(0,"")$

country$\_$selected $=$ st$.$selectbox$("$Select a country", options$=$countries$\_$list$)$

if country$\_$selected:

states$\_$dict $=$ generate$\_$list$\_$of$\_$states$($country$\_$selected$)$

if states$\_$dict$["$status$"]==$ "success":

states$\_$list $=[$i$["$state$"]$ for i in states$\_$dict$["$data$"]]$

states$\_$list.insert$(0,"")$

state$\_$selected $=$ st$.$selectbox$("$Select a state", options$=$states$\_$list$)$

if state$\_$selected:

cities$\_$dict $=$ generate$\_$list$\_$of$\_$cities$($state$\_$selected, country$\_$selected$)$

if cities$\_$dict$["$status$"]==$ "success":

cities$\_$list $=[$i$["$city$"]$ for i in cities$\_$dict$["$data$"]]$

cities$\_$list.insert$(0,"")$

city$\_$selected $=$ st$.$selectbox$("$Select a city", options$=$cities$\_$list$)$

if city$\_$selected:

aqi$\_$data$\_$url $=$"YOUR$\_$API$\_$KEY$\_$HERE"

aqi$\_$data$\_$dict $=$ requests.get$($aqi$\_$data$\_$url$).$json$()$

if aqi$\_$data$\_$dict$["$status$"]==$ "success":

display$\_$data$($aqi$\_$data$\_$dict$["$data$"])$

map$\_$creator$($aqi$\_$data$\_$dict$["$data$"]["$location$"]["$coordinates$"][1],$ aqi$\_$data$\_$dict$["$data$"]["$location$"]["$coordinates$"][0])$

else:

st$.$warning$("$No data available for this location."$)$

else:

st$.$warning$("$No cities available, please select another state."$)$

else:

st$.$warning$("$No states available, please select another country."$)$

else:

st$.$error$("$Too many requests. Wait for a few minutes before your next API call."$)$

elif category $=="$By Nearest City $($IP Address$)"$:

url $=$"YOUR$\_$API$\_$KEY$\_$HERE"$=$ requests.get$($url$).$json$()$

if aqi$\_$data$\_$dict$["$status$"]==$ "success":

display$\_$data$($aqi$\_$data$\_$dict$["$data$"])$

map$\_$creator$($aqi$\_$data$\_$dict$["$data$"]["$location$"]["$coordinates$"][1],$ aqi$\_$data$\_$dict$["$data$"]["$location$"]["$coordinates$"][0])$

else:

st$.$warning$("$No data available for this location."$)$

elif category $=="$By Latitude and Longitude":

latitude $=$ st$.$text$\_$input$("$Enter latitude"$)$

longitude $=$ st$.$text$\_$input$("$Enter longitude"$)$

if latitude and longitude:

url $=$"YOUR$\_$API$\_$KEY$\_$HERE"

aqi$\_$data$\_$dict $=$ requests.get$($url$).$json$()$

if aqi$\_$data$\_$dict$["$status$"]==$ "success":

display$\_$data$($aqi$\_$data$\_$dict$["$data$"])$

map$\_$creator$($aqi$\_$data$\_$dict$["$data$"]["$location$"]["$coordinates$"][1],$ aqi$\_$data$\_$dict$["$data$"]["$location$"]["$coordinates$"][0])$

else:

st$.$warning$("$No data available for this location."$)$