app/assets/stylesheets/1st_load_framework.css.scss
// import the CSS framework// Do not use *= require in Sass or your other stylesheets will not be able to access the Bootstrap mixins and variables.Prefer single quoted strings@import "bootstrap"; // make all images responsive by defaultimg {Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .img-fluid; margin: 0 auto;}// override for the 'Home' navigation link.navbar-brand { font-size: inherit; } // THESE ARE EXAMPLES YOU CAN MODIFY// create your own classes// to make views framework-neutral.column {Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .col-md-6; text-align: center;Rule declaration should be followed by an empty line}.form {Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .col-md-6;Rule declaration should be followed by an empty line}.form-centered {Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .col-md-6; text-align: center;Rule declaration should be followed by an empty line}.submit {Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .btn;Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .btn-primary;Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .btn-lg;} // apply styles to HTML elements// to make views framework-neutralmain {Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .container; margin-top: 30px; // accommodate the navbar} section {Prefer using placeholder selectors (e.g. %some-placeholder) with @extend @extend .row; margin-top: 20px;}