My Flarum's custom CSS shim.

neonriot.css

/*

Main color:   #00BF93 / #00917E
2ndary color: #4D698E

*/

@import 'https://fonts.googleapis.com/css?family=Ubuntu';

.App-header {
  background-color: #14191f;
  background-image: url('http://i.imgur.com/duab0vq.png');

  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;  
}

body {
  font-family: 'Ubuntu', sans-serif;
  background-color: #efefef;
}

.Header-title a, #home-link {
  text-transform: lowercase;
  font-weight: 800;
  font-variant: small-caps;
  color: #00FFB7;
}

.WelcomeHero {

  background: #5713a0;



  /* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#5d0f84+0,00876e+89 */
  background: rgb(93,15,132); /* Old browsers */
  background: -moz-linear-gradient(-45deg, rgba(93,15,132,1) 0%, rgba(0,135,110,1) 89%); /* FF3.6-15 */
  background: -webkit-linear-gradient(-45deg, rgba(93,15,132,1) 0%,rgba(0,135,110,1) 89%); /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(135deg, rgba(93,15,132,1) 0%,rgba(0,135,110,1) 89%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#5d0f84', endColorstr='#00876e',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */


  
  color: #fff;
}

.Alert {
  background: #14191f;
  border: 1px solid #098058; /* #00DE94; */
  color: #00DE94;
  margin: 0.6em;
}

.Alert .Button-label {
  color: #00DE94;
  text-decoration-color: #00DE94;
  -moz-text-decoration-color: #00DE94;
}


.Navigation-pin, .Navigation-back {
  background-color: #14191f;
}

input.FormControl, input.FormControl:focus {
  background-color: #14191f;
  color: #eee;
}

.Button--flat {
  background-color: #14191f;
}

.Dropdown-toggle:hover, .Dropdown-toggle:focus {
  background-color: #14191f;
}

.Dropdown-toggle:active, 
.Dropdown-toggle:focus, 
.Dropdown-toggle.active, 
.Dropdown-toggle.focus, 
.Dropdown-toggle.open, 
.Button--flat.focus,
.Button--flat:focus,
.Button--flat.active,
.Button--flat:active,
.Button--flat.open {
  background-color: #101418;
}