@media (max-width: 425px){

    .principal-section .container
  {    width: 100%;
       padding-right: 0;
       margin-right: 0;
       padding-left: 5px;
       margin-left: 0;
  }

  .principal-section .container .welcome-note{
  background-color: #ffffffd5;
  margin-top: 30px;
  width: 100%;
  margin-left: 0px;
  margin-bottom: 10px;
  padding: 20px;
  box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5);
  }

  .caption{
          flex: 1 1 100%;
  }

  .principal-section .container .principal-img
{
  
  display: block;
  height: 270px;
  margin: 0 auto;
}

}