header {
    padding: 1em;
    color: white;
	background-color: #000000;
    background-image: linear-gradient(to bottom right, #404040, #000000);
    clear: left;
    text-align: center;
}
footer {
	padding: 1em;
        clear: left;
    text-align: center;

color:#999;}

.invisible {
  visibility: hidden;
}

// Usage as a mixin
.element {
  @include invisible;
}

.article {
    text-align: left;
	margin:15px 0px 15px 0px;
}

.affix {
      top: 0;
      width: 100%;
      z-index: 9999 !important;
  }

.affix + .container-fluid {
      padding-top: 86px;
  }
.table > thead > tr > td,
.table > tbody > tr > td,
.table > tfoot > tr > td  {
	
	line-height: 4;
}
.loader {
	margin-top: 50%;
    margin-bottom: 11px;
    margin-right: auto;
    margin-left: auto;
  border: 16px solid #fff;
  border-radius: 50%;
border-top: 16px solid #3498db;
 border-bottom: 16px solid #3498db;
  width: 120px;
  height: 120px;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
}

@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}