diff --git a/frontend/src/certs/Registers/index.tsx b/frontend/src/certs/Registers/index.tsx
index 0866c64..72e1122 100644
--- a/frontend/src/certs/Registers/index.tsx
+++ b/frontend/src/certs/Registers/index.tsx
@@ -32,8 +32,8 @@ export function Registers(props: {person: Person | null, count: number}) {
                 if (response.status === 200) {
                     setRegisters(response.data.Ok);
                 } else {
-                    console.error(response.data.Err);
-                    setError(response.data.Err.reason);
+                    console.error(response.data.Error);
+                    setError(response.data.Error.reason);
                 }
             })
             .catch((err) => {
@@ -101,20 +101,29 @@ export function Registers(props: {person: Person | null, count: number}) {
             ?.filter((r) => r.register_creation_date === today) ?? [];
     });
 
+
+    const [downButtonBg, setDownButtonBg] = createSignal("bg-c-primary text-c-on-primary");
     const downloadTodayCerts = () => {
         if (props.person === null) return;
 
         todayRegisters().forEach((register) => {
             generateCert(props.person!, register);
         });
+
+        setDownButtonBg("bg-c-success text-c-on-success");
+
+        setTimeout(() => {
+            setDownButtonBg("bg-c-primary text-c-on-primary");
+        }, 1000);
     };
 
+
     return (
         <div class="m-4 p-4 rounded-md relative">
             <h3 class="text-xl font-medium">
                 <button
-                    class="bg-c-primary text-c-on-primary inline-block mr-2 rounded-full
-                        disabled:opacity-25 disabled:cursor-not-allowed px-2"
+                    class={`${downButtonBg()} inline-block mr-2 rounded-full transition-colors
+                        disabled:opacity-25 disabled:cursor-not-allowed px-2`}
                     disabled={todayRegisters().length === 0}
                     title="Descargar todos los cert. creados hoy"
                     onclick={downloadTodayCerts}
@@ -276,7 +285,7 @@ function generateCert(person: Person, register: Register) {
 
     const generator = certGenerator[courseN];
     if (generator === undefined) {
-        alert(`Generator function with key \`${courseN}\` not found`);
+        alert(`El cert \`${courseN}\` no está implementado`);
         return;
     }