diff --git a/Universidad/base_page.master b/Universidad/base_page.master
index f62ccfc..894894b 100644
--- a/Universidad/base_page.master
+++ b/Universidad/base_page.master
@@ -16,7 +16,7 @@
         <nav class="navbar fixed-top navbar-dark bg-primary">
             <a class="navbar-brand" href="/index.aspx">Bienvenido: <asp:Literal ID="username_literal" runat="server"/></a>
         </nav>
-        <div class="container">
+        <div class="container-fluid">
             <div class="row">
                 <div class="col-2 sidebar">
                     <ul class="nav flex-column">
diff --git a/Universidad/css/style.css b/Universidad/css/style.css
index 4832a4e..d3e4efb 100644
--- a/Universidad/css/style.css
+++ b/Universidad/css/style.css
@@ -1,4 +1,4 @@
-.container {
+.container-fluid {
     padding-top: 6em;
     padding-bottom: 6em;
 }
@@ -24,4 +24,10 @@
     margin-top: 0.25rem;
     font-size: 0.875em;
     color: #dc3545;
+}
+
+.table .thead-primary th {
+    color: #fff;
+    background-color: #0d6efd;;
+    border-color: #454d55;
 }
\ No newline at end of file
diff --git a/Universidad/listar.aspx b/Universidad/listar.aspx
index 3b02b24..58370cd 100644
--- a/Universidad/listar.aspx
+++ b/Universidad/listar.aspx
@@ -5,7 +5,8 @@
 </asp:Content>
 <asp:Content ID="Content2" ContentPlaceHolderID="content" runat="Server">
     <h1>Participantes</h1>
-    <asp:GridView ID="participantes_grid" CssClass="table table-borderless table-striped table-hover"  HeaderStyle-CssClass="thead-dark" OnRowDataBound="ParticipantesRowDataBound" runat="server"/>
+    <p><asp:Literal ID="empty_message" runat="server"/></p>
+    <asp:GridView ID="participantes_grid" CssClass="table table-borderless table-striped table-hover"  HeaderStyle-CssClass="thead-primary" OnRowDataBound="ParticipantesRowDataBound" runat="server"/>
 </asp:Content>
 <asp:Content ID="Content3" ContentPlaceHolderID="script" runat="Server">
 </asp:Content>
diff --git a/Universidad/listar.aspx.cs b/Universidad/listar.aspx.cs
index a05db69..f143d7c 100644
--- a/Universidad/listar.aspx.cs
+++ b/Universidad/listar.aspx.cs
@@ -20,8 +20,15 @@ public partial class listar : System.Web.UI.Page
             Carrera = p.carrera.nombre,
             Seminario = p.seminario.nombre
         };
-        participantes_grid.DataSource = participantes.ToList();
-        participantes_grid.DataBind();
+        if (participantes.Count() > 0)
+        {
+            participantes_grid.DataSource = participantes.ToList();
+            participantes_grid.DataBind();
+        }
+        else
+        {
+            empty_message.Text = "No hay participantes registrados";
+        }
     }
 
     protected void ParticipantesRowDataBound(object sender, GridViewRowEventArgs e)
@@ -36,6 +43,5 @@ public partial class listar : System.Web.UI.Page
             e.Row.Cells[5].Text = "Carrera";
             e.Row.Cells[6].Text = "Seminario";
         }
-
     }
 }
\ No newline at end of file
diff --git a/Universidad/modificar_participante.aspx.cs b/Universidad/modificar_participante.aspx.cs
index ac3c2b2..654c2dd 100644
--- a/Universidad/modificar_participante.aspx.cs
+++ b/Universidad/modificar_participante.aspx.cs
@@ -53,6 +53,9 @@ public partial class modificar_participante : System.Web.UI.Page
             carrera_select.DataValueField = "id";
             carrera_select.DataBind();
             carrera_select.Items.Insert(0, "Seleccione una Carrera");
+        } else
+        {
+            carrera_select.Items.Clear();
         }
     }
     protected void OnBuscarClick(object sender, EventArgs e)
diff --git a/Universidad/registrar_participante.aspx.cs b/Universidad/registrar_participante.aspx.cs
index 8e8f268..fe0e61c 100644
--- a/Universidad/registrar_participante.aspx.cs
+++ b/Universidad/registrar_participante.aspx.cs
@@ -53,6 +53,10 @@ public partial class registrar_participante : System.Web.UI.Page
             carrera_select.DataBind();
             carrera_select.Items.Insert(0, "Seleccione una Carrera");
         }
+        else
+        {
+            carrera_select.Items.Clear();
+        }
     }
 
     protected void OnRegistrarClick(object sender, EventArgs e)