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HTML 

              
                svg#maks(xmlns='http://www.w3.org/2000/svg', xmlns:xlink='http://www.w3.org/1999/xlink', viewbox='-50 0 1000 1000')
  defs
    clippath#clip-path
      circle(cx='450', cy='500', r='450')
    radialgradient#sky-gradient(cx='565', cy='533', r='491.15', gradientunits='userSpaceOnUse')
      stop.sky-bright(offset='0')
      stop.sky-dark(offset='1')
    lineargradient#mountain-gradient(x1='353', y1='735.58', x2='353', y2='468.49', gradientunits='userSpaceOnUse')
      stop.mountain-bright(offset='0')
      stop.mountain-dark(offset='1')
    lineargradient#hill1-gradient(x1='498', y1='827.07', x2='498', y2='537.27', gradientunits='userSpaceOnUse')
      stop.hills-bright(offset='0')
      stop.hills-dark(offset='1')
    lineargradient#hill2-gradient(x1='308', y1='1064.12', x2='308', y2='733.42', gradientunits='userSpaceOnUse')
      stop.hills2-bright(offset='0')
      stop.hills2-dark(offset='1')
  g.cls-3(clip-path='url(#clip-path)')
    rect#sky.sky(width='1000', height='1000')
    g#mountains
      path.mountains(d='M231 349l65 81 48-41 71 69 115-60 178 120v334L0 846l-2-300 233-197')
      path.peaks(d='M173 398l22 36 38-30 39-3-41-52-58 49m135 22l28 24 40-24-32-31-36 31m185-2l32 26 46-19-41-27-37 20')
    g#hills
      path.hills(d='M998,1017H-2s0-277,0-375c84-48,211-79,355-79h47c74-40,176-64,289-64s309,75,309,75Z')
      ellipse.hill(cx='308', cy='986', rx='478', ry='295') 
    g#particles
      -i = 10
      while i--
        g.particle-conntainer
          circle.particle(r=Math.random()*5+5 cx=0 cy=400+i*50)
    g#tree
      path.tree(d='M971,336c-46,23-111,66-160,143a385,385,0,0,0-22,41q-4-105-7-209-2-68-2-135c0-23,0-45,0-68s0-45,1-68H707q1,34,1,68c0,23,0,45,0,68s0,34-1,50a327,327,0,0,1-97-17c-17-6-20-9-22-10-28-23-27-88,2-157L564,31c-36,84-33,159,6,191,4,4,11,8,30,14a356,356,0,0,0,106,19q-1,28-1,56-3,105-7,209l-2-2a208,208,0,0,0-40-36,204,204,0,0,0-48-24l-16-5-4-5-9-15a115,115,0,0,1-7-16l-2-9V387c0-1,0-3,0-4a118,118,0,0,1,1-18,123,123,0,0,1,11-34,124,124,0,0,0-13,34,121,121,0,0,0-3,18c0,2,0,3,0,5v23l2,9a122,122,0,0,0,6,18l6,13-21-5c-17-4-33-8-48-14a144,144,0,0,1-42-25l-9-9-8-9a167,167,0,0,1-14-21,191,191,0,0,1-11-23,252,252,0,0,1-9-24,253,253,0,0,0,7,25,194,194,0,0,0,10,24,171,171,0,0,0,13,22l8,10,9,10a154,154,0,0,0,43,30c16,8,32,13,49,18s32,10,47,16a178,178,0,0,1,75,59,201,201,0,0,1,20,32v15q-6,135-15,270-5,68-10,135c-2,23-4,45-6,68s-4,45-7,68H829q-4-34-7-68c-2-23-4-45-6-68q-6-68-10-135-9-127-15-255a357,357,0,0,1,44-102c45-71,105-112,148-133Z')
      path.bark(d="M703 370l40 12-40 9m2-99l46 12-46 8m2-162l25 6-25 5m-8 315l40 12-40 9m-7 140l59 12-60 9m-8 132l61 12-63 9m119-62l-56-11 55-8m-13-278l-42-8 41-6m-3-93l-28-3 28-3m-3-126l-25-8 25-4")
.title spring
!

CSS 

              
                .tree {
  fill: #fff;
}
.sky-bright{ stop-color:#fff}
.sky-dark { stop-color:oc(7,2)}

.mountain-bright{ stop-color:oc(5,5)}
.mountain-dark { stop-color:oc(4,3)}

.hills-bright{ stop-color:oc(5,6)}
.hills-dark { stop-color:oc(4,7)}

.hills2-bright{ stop-color:oc(5,7)}
.hills2-dark { stop-color:oc(4,8)}


.sky {
  fill: url(#sky-gradient);
}

.mountains{
  fill: url(#mountain-gradient);
}

.peaks {
  fill: #fff;
}

.hills{
  fill: url(#hill1-gradient);
}

.hill {
  fill: url(#hill2-gradient);
}


/*Page Setup*/

@import url('https://fonts.googleapis.com/css?family=Unica+One');
svg {
  width: 100vw;
  height: 80vh;
}

.particle-conntainer {
  fill:rgba(255,255,255,.6);
  stroke: rgba(255,255,255,.3);
  stroke-width: 10;
  animation: float 10s linear infinite; 
  --amplitude: 50px;
  .particle{
    animation: occilate 2s ease-in-out infinite alternate;
  }
  
  @for $i from 1 through 10{
    &:nth-child(#{$i}){
      --amplitude:  10px + random(40)*1px;
      $duration: 10s + random(40)*0.5s;
      animation-duration: $duration;
      animation-delay: $i * random(10)* -0.5s;
      .particle{
        animation-duration:  $duration/4;
      }
    }
  }
}

@keyframes occilate{
  100%{
    transform: translate(0,var(--amplitude));
  }
}

@keyframes float{
  100%{
    transform: translate(1000px,0);
  }
}


body {
  background: oc(3,1);
  color: oc(5,9);
  display: flex; 
  align-items:center;
  justify-content: center;
  flex-direction: column;
}
.title {
  height: 10vh;
  line-height: 10vh;
  font-size: 8vh;
  padding: 2.5vh;
  margin: 0;
  border-top: 1px solid;
  border-bottom: 1px solid;
  font-family: 'Unica One', cursive;
}
!

JS
!
999px

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