.%%appname%%.main-view {
  background: white;
}

.%%appname%% .welcome-view {

  background: #eee;

  height: auto;
  width: 200px;

  margin: 50px auto;

  border: 1px solid #ccc;
  border-radius: 4px;

  padding:10px;

  text-align:center;

}

.%%appname%%.main-view {
  background: white;
}

.%%appname%% .welcome-view {

  background: #eee;

  height: auto;
  width: auto;
  max-width: 300px;

  margin: 50px auto;

  border: 1px solid #ccc;
  border-radius: 4px;

  padding:10px;

  text-align:center;

}

Update blank app template css
Update blank app template css
