###config/routes.rb

root 'posts#index'

###app/views/layouts/application.html.erb

...
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
...
<header class="jumbotron site-header">
  <div class="container text-center">
    <h1>My Rails Blog</h1>
  </div>
</header>
<div class="container">
  <%= yield %>
</div>
...

###app/assets/stylesheets/scaffolds.scss

(Delete everything inside of this file)

###app/assets/stylesheets/posts.scss

.site-header {
    /* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#3100b8+0,2f00ea+33,2f00ea+33,3103ff+50,8067ff+100 */
    background: #3100b8; /* Old browsers */
    background: -moz-linear-gradient(left,  #3100b8 0%, #2f00ea 33%, #2f00ea 33%, #3103ff 50%, #8067ff 100%); /* FF3.6-15 */
    background: -webkit-linear-gradient(left,  #3100b8 0%,#2f00ea 33%,#2f00ea 33%,#3103ff 50%,#8067ff 100%); /* Chrome10-25,Safari5.1-6 */
    background: linear-gradient(to right,  #3100b8 0%,#2f00ea 33%,#2f00ea 33%,#3103ff 50%,#8067ff 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#3100b8', endColorstr='#8067ff',GradientType=1 ); /* IE6-9 */
}
.site-header h1 {
    color: white;
}