mist-connections/public/style.css

html, body {
  margin: 0;
  padding: 0;
}
body {
  background: #000;
  background: rgba(200, 200, 200, 200);
/*   background: rgba(0, 0, 0, 1); */
  overflow-x: hidden; 
}
div#app {
  z-index: 100;
  position: fixed;
}

/* ---------- Fog ---------- */

.fog-background {
/*  z-index: -1000;
  position: sticky;*/
}

.fogwrapper {
  height: 100%;
  position: absolute;
  top: 0;
  width: 100%;
  -webkit-filter: blur(1px) grayscale(0.2) saturate(1.2) sepia(0.2);
  filter: blur(1px) grayscale(0.2) saturate(1.2) sepia(0.2);
}
#foglayer_01, #foglayer_02, #foglayer_03 {
  height: 100%;
  position: absolute;
  width: 200%;
}
#foglayer_01 .image01, #foglayer_01 .image02,
#foglayer_02 .image01, #foglayer_02 .image02,
#foglayer_03 .image01, #foglayer_03 .image02 {
  float: left;
  height: 100%;
  width: 50%;
  color: #0f0d2d8a;
}
#foglayer_01 {
  -webkit-animation: foglayer_01_opacity 10s linear infinite, foglayer_moveme 15s linear infinite;
  -moz-animation: foglayer_01_opacity 10s linear infinite, foglayer_moveme 15s linear infinite;
  animation: foglayer_01_opacity 10s linear infinite, foglayer_moveme 15s linear infinite;
}
#foglayer_02, #foglayer_03 {
  -webkit-animation: foglayer_02_opacity 21s linear infinite, foglayer_moveme 13s linear infinite;
  -moz-animation: foglayer_02_opacity 21s linear infinite, foglayer_moveme 13s linear infinite;
  animation: foglayer_02_opacity 21s linear infinite, foglayer_moveme 13s linear infinite;
}

/* ---------- Moving Fog ---------- */
/*
  'size: cover' || 'size: 100%'; results remain the same
  'attachment: scroll' can be added or removed; results remain the same
  'attachment: fixed' causing unexpected results in Chrome
  'repeat-x' || 'no-repeat'; results remain the same
*/ 
#foglayer_01 .image01, #foglayer_01 .image02 {
  background: url("https://raw.githubusercontent.com/danielstuart14/CSS_FOG_ANIMATION/master/fog1.png") center center/cover no-repeat transparent;
}
#foglayer_02 .image01, #foglayer_02 .image02,
#foglayer_03 .image01, #foglayer_03 .image02{
  background: url("https://raw.githubusercontent.com/danielstuart14/CSS_FOG_ANIMATION/master/fog2.png") center center/cover no-repeat transparent;
}

/* ---------- Keyframe Layer 1 ---------- */
@-webkit-keyframes foglayer_01_opacity {
  0% { opacity: .1; }
  22% { opacity: .5; }
  40% { opacity: .28; }
  58% { opacity: .4; }
  80% { opacity: .16; }
  100% { opacity: .1; }
}
@-moz-keyframes foglayer_01_opacity {
  0% { opacity: .1; }
  22% { opacity: .5; }
  40% { opacity: .28; }
  58% { opacity: .4; }
  80% { opacity: .16; }
  100% { opacity: .1; }
}
@-o-keyframes foglayer_01_opacity {
  0% { opacity: .1; }
  22% { opacity: .5; }
  40% { opacity: .28; }
  58% { opacity: .4; }
  80% { opacity: .16; }
  100% { opacity: .1; }
}
@keyframes foglayer_01_opacity {
  0% { opacity: .1; }
  22% { opacity: .5; }
  40% { opacity: .28; }
  58% { opacity: .4; }
  80% { opacity: .16; }
  100% { opacity: .1; }
}
/* ---------- Keyframe Layer 2 ---------- */
@-webkit-keyframes foglayer_02_opacity {
  0% { opacity: .5; }
  25% { opacity: .2; }
  50% { opacity: .1; }
  80% { opacity: .3; }
  100% { opacity: .5; }
}
@-moz-keyframes foglayer_02_opacity {
  0% { opacity: .5; }
  25% { opacity: .2; }
  50% { opacity: .1; }
  80% { opacity: .3; }
  100% { opacity: .5; }
}
@-o-keyframes foglayer_02_opacity {
  0% { opacity: .5; }
  25% { opacity: .2; }
  50% { opacity: .1; }
  80% { opacity: .3; }
  100% { opacity: .5; }
}
@keyframes foglayer_02_opacity {
  0% { opacity: .5; }
  25% { opacity: .2; }
  50% { opacity: .1; }
  80% { opacity: .3; }
  100% { opacity: .5; }
}
/* ---------- Keyframe Layer 3 ---------- */
@-webkit-keyframes foglayer_03_opacity {
  0% { opacity: .8 }
  27% { opacity: .2; }
  52% { opacity: .6; }
  68% { opacity: .3; }
  100% { opacity: .8; }
}
@-moz-keyframes foglayer_03_opacity {
  0% { opacity: .8 }
  27% { opacity: .2; }
  52% { opacity: .6; }
  68% { opacity: .3; }
  100% { opacity: .8; }
}
@-o-keyframes foglayer_03_opacity {
  0% { opacity: .8 }
  27% { opacity: .2; }
  52% { opacity: .6; }
  68% { opacity: .3; }
  100% { opacity: .8; }
}
@keyframes foglayer_03_opacity {
  0% { opacity: .8; }
  27% { opacity: .2; }
  52% { opacity: .6; }
  68% { opacity: .3; }
  100% { opacity: .8; }
}
/* ---------- Keyframe moveMe ---------- */
@-webkit-keyframes foglayer_moveme {
  0% { left: 0; }
  100% { left: -100%; }
}
@-moz-keyframes foglayer_moveme {
  0% { left: 0; }
  100% { left: -100%; }
}
@-o-keyframes foglayer_moveme {
  0% { left: 0; }
  100% { left: -100%; }
}
@keyframes foglayer_moveme {
  0% { left: 0; }
  100% { left: -100%; }
}

@media only screen
  and (min-width: 280px)
  and (max-width: 767px) {
    #foglayer_01 .image01, #foglayer_01 .image02,
    #foglayer_02 .image01, #foglayer_02 .image02,
    #foglayer_03 .image01, #foglayer_03 .image02 {
      width: 100%;
    }
  }