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</svg>
</div><!--background-container-->
<div class="background-container">
  <div class="backtop"></div>
  <div class="backbottom"></div>
</div>

.pos-bg {
  position: relative;
  left: -50%;
}

body {
  background: #000;
}

.background-container {
  position: absolute;
  left: 50%;
  top:0;
}

.background {
  @extend .pos-bg;
  width: 857px;
  height: 500px; 
  z-index: 300;
  opacity: 0.7;
}

.backtop {
  @extend .pos-bg;
  top: 0;
  height: 290px;
  width: 850px;
   background: rgb(63,88,113); /* Old browsers */
  background: -moz-linear-gradient(left, rgba(63,88,113,1) 0%, rgba(105,137,143,1) 31%, rgba(156,179,163,1) 70%, rgba(194,217,189,1) 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, right top, color-stop(0%,rgba(63,88,113,1)), color-stop(31%,rgba(105,137,143,1)), color-stop(70%,rgba(156,179,163,1)), color-stop(100%,rgba(194,217,189,1))); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(left, rgba(63,88,113,1) 0%,rgba(105,137,143,1) 31%,rgba(156,179,163,1) 70%,rgba(194,217,189,1) 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(left, rgba(63,88,113,1) 0%,rgba(105,137,143,1) 31%,rgba(156,179,163,1) 70%,rgba(194,217,189,1) 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(left, rgba(63,88,113,1) 0%,rgba(105,137,143,1) 31%,rgba(156,179,163,1) 70%,rgba(194,217,189,1) 100%); /* IE10+ */
  background: linear-gradient(to right, rgba(63,88,113,1) 0%,rgba(105,137,143,1) 31%,rgba(156,179,163,1) 70%,rgba(194,217,189,1) 100%); /* W3C */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#3f5871', endColorstr='#c2d9bd',GradientType=1 ); /* IE6-9 */
}

.backbottom {
  @extend .pos-bg;
  top: 0;
  height: 200px;
  width: 850px;
  opacity: 0.9;
  background: rgb(17,19,58); /* Old browsers */
background: -moz-linear-gradient(left, rgba(17,19,58,1) 0%, rgba(45,46,60,1) 25%, rgba(38,79,89,1) 55%, rgba(38,79,89,1) 74%, rgba(72,102,97,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, right top, color-stop(0%,rgba(17,19,58,1)), color-stop(25%,rgba(45,46,60,1)), color-stop(55%,rgba(38,79,89,1)), color-stop(74%,rgba(38,79,89,1)), color-stop(100%,rgba(72,102,97,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(left, rgba(17,19,58,1) 0%,rgba(45,46,60,1) 25%,rgba(38,79,89,1) 55%,rgba(38,79,89,1) 74%,rgba(72,102,97,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(left, rgba(17,19,58,1) 0%,rgba(45,46,60,1) 25%,rgba(38,79,89,1) 55%,rgba(38,79,89,1) 74%,rgba(72,102,97,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(left, rgba(17,19,58,1) 0%,rgba(45,46,60,1) 25%,rgba(38,79,89,1) 55%,rgba(38,79,89,1) 74%,rgba(72,102,97,1) 100%); /* IE10+ */
background: linear-gradient(to right, rgba(17,19,58,1) 0%,rgba(45,46,60,1) 25%,rgba(38,79,89,1) 55%,rgba(38,79,89,1) 74%,rgba(72,102,97,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#11133a', endColorstr='#486661',GradientType=1 ); /* IE6-9 */
}

.cloud, .cloud2, .cloud3, .cloud4 {
  transform: translateZ(0);
  transform-origin: 50%;
  opacity: 0.8;
}

.cloud {
  animation: move 40s linear infinite;
}

.cloud2 {
  animation: move 50s -20s linear infinite;
}

.cloud3 {
  animation: move 60s -80s linear infinite;
}

.cloud4 {
  animation: move 90s -80s linear infinite;
}

@keyframes move {
  0% { transform: translateX(900px); opacity: 0.9; }
  50%   { transform: translateX(0); opacity: 0.3; }
  100% { transform: translateX(-900px); opacity: 0.9; }
}