Ruby on Rails: nice style for ActiveAdmin

admin.css.scss

*, *:before, *:after {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}

body.active_admin {
  form {
    #{$all-text-inputs},textarea,select[multiple="multiple"] {
      border: 1px solid #c9d0d6; @include rounded(3px); font-size: 1em; outline: none; padding: 5px 5px 7px; margin-bottom: 5px;
    }
    #{$all-text-inputs-focus},textarea:focus,select[multiple="multiple"]:focus {
      border: 1px solid #99a2aa; @include shadow(0, 0, 4px, #99a2aa); @include transition(border, linear, 0.2s); @include transition(box-shadow, linear, 0.2s);
    }
    select[multiple="multiple"] { min-width: 200px;}
  }
  
  #header {
    ul#tabs > li a { @include rounded(3px); }
    ul#tabs > li.has_nested:hover > a {
      @include rounded-top(3px);
    }
    ul#tabs > li ul {
      @include rounded-all(0, 3px, 3px, 3px)
    }
  }
  &.logged_in {
    .flash { top: 0px; }
  }
  .breadcrumb {
    display: block;
    font-size: 1em;
    font-weight: normal;
    line-height: 1.0em;
    margin-bottom: 5px;
    text-transform: capitalize;
  }
  #title_bar {
    padding: 0px 30px;
    margin-bottom: 0;
    
    h2 { font-size: 1.5em; }
    
    .action_items a {
      @include rounded(3px);
      padding: 6px 8px 5px;
    }
    
    #titlebar_left, #titlebar_right {
      height: 40px;
      vertical-align: middle;
      display: table-cell;
    }
  }
}