muzich/web/bundles/muzichindex/css/index.css

.hello
{
  background-color: #f4f4f4;
  padding: 30px;
}

.hello .login_box
{
  width: 640px;
  margin-left: auto;
  margin-right: auto;
  background-color: #e3f6fd;
  padding: 20px;
}