section { background-size: 256px 256px, cover !important; 
background-attachment: scroll, fixed !important; min-height: 100vh;}

#intro .content { padding:1em; background-color: rgba(100,100,100,0.5); border-radius: 1em;}
#intro .content a { color: white; }

.video-container {
  position:relative;
  padding-bottom:56.25%;
  padding-top:30px;
  height:0;
  overflow:hidden;
}

.video-container iframe, .video-container object, .video-container embed {
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
}

.alert-success {
  color: #3c763d;
  background-color: #dff0d8;
  border-color: #d6e9c6;
}
.alert {
  padding: 15px;
  margin: 0 auto 20px;
  border: 1px solid transparent;
  border-radius: 4px;
  width: 350px;
}
.alert-danger {
  color: #a94442;
  background-color: #f2dede;
  border-color: #ebccd1;
}