@media  (min-width: 600px){
    

html, body {
  margin: 0;
  overflow-x: hidden;
}

main {
  overflow: visible;
}

.pre-scroll-spacer {
  height: 100vh;
  min-height: 100vh;
}

.post-scroll-spacer {
  height: 100vh;
  min-height: 100vh;
}

.m-about {
  position: relative;
  width: 100vw;
  overflow: hidden;
}

.m-about__track {
  display: flex;
  width: max-content;
  align-items: stretch;
}

.m-about__sec1,
.m-about__sec2,
.m-about__sec4W {
  flex: 0 0 100vw !important;
  min-width: 100vw !important;
  background-size: cover;
  background-position: center;
}

.m-about__sec3 {
  display: block !important;
  flex: 0 0 30vw !important;
  min-width: 30vw !important;
}
.m-slide-40{
  background-image: url(https://klm-art.ru/upload/resize_cache/iblock/129/960_540_2/eocckyzsi8yak9xfxo63j5lxt9invyke.jpg);
  width: 40%;
  min-width: 40vw !important;
  flex: 0 0 40vw !important;
  margin: 0 20px;
}
.m-about__sec4W {
  position: relative;
}

.m-about__sec5 {
  z-index: 5;
}

/* smoother reveal animations */
.m-about__imgw,
.m-about__sec5-item,
.m-about__map-item,
.m-about__sec1-d .tMR,
.m-about__sec2-d1,
.m-about__sec2-d2 .tMR,
.m-about__sec5-det .tMR {
  will-change: transform, opacity;
}
}