pequeña mejora

Frontend/client/src/app/app.component.html

+<div class="container mt-4">
     <div class="row justify-content-around">
         <div class="col-7">
         <h2 class="app_title">{{title}}</h2>        
         </div>
     </div>
+</div>
+
 
-<div class="container mt-3">
+<div class="container mt-4">
     <div class="col-15">
         <div class="row justify-content-center">
             <div class="col-4">