.mountains{position:absolute;left:0;right:0;top:24vh;height:46vh;pointer-events:none}
.mountain{
  position:absolute;bottom:0;width:0;height:0;
  border-left:22vw solid transparent;border-right:22vw solid transparent;
  border-bottom:48vh solid var(--mount-1);
  filter:drop-shadow(0 18px 22px rgba(0,0,0,.25));
}
.m1{left:0;border-bottom-color:var(--mount-1)}
.m2{left:26%;border-left-width:25vw;border-right-width:25vw;border-bottom-width:52vh;border-bottom-color:var(--mount-2)}
.m3{left:62%;border-bottom-color:var(--mount-3)}