diff --git a/src/lib/db_models.rb b/src/lib/db_models.rb
index 4e780f3..f559f30 100644
--- a/src/lib/db_models.rb
+++ b/src/lib/db_models.rb
@@ -324,22 +324,45 @@ class Auction < EntityModel
 		self.insert data
 	end
 
-	def self.compose_query_filters(title=nil, categories=nil, price_rng=nil, expired=nil)
-		querystr = "SELECT * FROM Auction "
-		querystr += "WHERE " if (title and title.length != 0) or categories or price_rng or expired
-
+	def self.compose_query_filters(title=nil, categories=nil, min_price=nil, max_price=nil, expired=nil)
+		querystr = "SELECT * FROM Auction WHERE "
 		filters = []
+
+		# Title filter
 		filters << "title LIKE '%#{title}%'" if title and title.length != 0
-		filters << "price BETWEEN #{price_rng[0]} AND #{price_rng[1]}" if price_rng && price_rng.length == 2
-		filters << "end_time < #{Time.now.to_i}" if !expired.nil?
+
+		# Price filters
+		if min_price and max_price then
+			filters << "price BETWEEN #{min_price} AND #{max_price}" 
+		elsif min_price then
+			filters << "price >= #{min_price}" 
+		elsif max_price then
+			filters << "price <= #{max_price}" 
+		end
+
+		# Time filter
+		filters << "end_time #{ expired == true ? "<" : ">" } #{Time.now.to_i}" 
+
+		# Categories filter
+		if categories then
+			ah_ids = []
+			categories.each do |catid|
+				if ah_ids == [] then
+					ah_ids = Auction_Category_relation.category_auction_ids(catid) # first time then include all
+				else
+					ah_ids |= Auction_Category_relation.category_auction_ids(catid) # union
+				end
+			end
+			filters << "id IN (#{ah_ids.join(", ")})" # check if the auction id is any of the ids calculated above
+		end
 
 		querystr += filters.join " AND "
 		return querystr
 	end
 
-	def self.search(title=nil, categories=nil, price_rng=nil, expired=nil)
-		q = self.compose_query_filters title, categories, price_rng, expired	
-		data = self.query(q) or []
+	def self.search(title=nil, categories=nil, min_price=nil, max_price=nil, expired=nil)
+		q = self.compose_query_filters title, categories, min_price, max_price, expired	
+		data = self.query(q) 
 		data.map! {|dat| self.new(dat)}
 	end
 
@@ -499,6 +522,11 @@ class Auction_Category_relation < EntityModel
 		@auction_id = data["auction_id"]
 		@category_id = data["category_id"]
 	end
+
+	def self.category_auction_ids(catid)
+		ids = self.get "auction_id", "category_id = ?", catid	
+		ids && ids.map! {|id| id["auction_id"].to_i}
+	end
 end
 
 
diff --git a/src/routes/auction.rb b/src/routes/auction.rb
index 9afc451..92f1543 100644
--- a/src/routes/auction.rb
+++ b/src/routes/auction.rb
@@ -1,9 +1,10 @@
 # Auction stuff
 get "/auctions" do
-	title = params[:title]
+	title = params[:title] and params[:title] != "" ? params[:title].strip : nil
 	categories = params[:categories]
-	min_price = params[:min_price]
-	max_price = params[:max_price]
+	categories.map! {|catid| catid.to_i} unless categories.nil?
+	min_price = params[:min_price].to_f > 0 ? params[:min_price].to_f : nil
+	max_price = params[:max_price].to_f > 0 ? params[:max_price].to_f : nil
 	expired = params[:expired] == "on"
 
 	auctions = Auction.search title, categories, min_price, max_price, expired
diff --git a/src/views/auction/index.slim b/src/views/auction/index.slim
index e7972a7..c440148 100644
--- a/src/views/auction/index.slim
+++ b/src/views/auction/index.slim
@@ -5,24 +5,24 @@
       .form-container
         form action="/auctions" method="get"
           label Keywords
-          input type="search" name="title" placeholder="Keywords (ex: computer, teapot)"
+          input type="search" name="title" placeholder="ex: computer, teapot"
 
           label Price range
           .range-container
             label for="price-min" From:
-            input type="number" name="price-min" min="#{MIN_INIT_PRICE}" max="#{MAX_INIT_PRICE}"
+            input type="number" name="min_price" value="#{params[:min_price].to_f >= 0 ? params[:min_price] : ""}" min="#{MIN_INIT_PRICE}" max="#{MAX_INIT_PRICE}"
             label for="price-max" To:
-            input type="number" name="price-max" min="#{MIN_INIT_PRICE}" max="#{MAX_INIT_PRICE}"
+            input type="number" name="max_price" value="#{params[:min_price].to_f >= 0 ? params[:min_price] : ""}" min="#{MIN_INIT_PRICE}" max="#{MAX_INIT_PRICE}"
 
           .checkbox-container
-            input type="checkbox" name="expired" 
+            input type="checkbox" name="expired" checked=("checked" if params[:expired] == "on")
             label Expired?
 
           - if Category.get_all.length > 0
             label Categories
-            select.card.border multiple="" name="categories[]"
+            select multiple="" name="categories[]"
               - Category.get_all.each do |category|
-                  option value="#{category.id}" selected=("selected" if params[:categories]&.include? category.id) style="color: #{category.color};" #{category.name}
+                option value="#{category.id}" selected=("selected" if params[:categories] and params[:categories].include?(category.id.to_s)) style="color: #{category.color};" #{category.name}
 
           input type="submit" value="Search"
       a.button href="/auctions" = "Clear Filters"
diff --git a/src/views/stylesheets/style.sass b/src/views/stylesheets/style.sass
index d06de17..d444944 100644
--- a/src/views/stylesheets/style.sass
+++ b/src/views/stylesheets/style.sass
@@ -277,6 +277,9 @@ ul.list-container
       input[type=checkbox]
         margin: 0 .5rem
 
+    select option:checked
+      background-color: $shadow_clr !important
+
     textarea
       background-color: $bg_dark_clr
       font-size: 1rem