body {
  margin: 0;
}

main {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: (1fr)[2];
  grid-template-columns: repeat(2, 1fr);
}
main section {
  width: 100%;
  height: 100vh;
}

#one,
#two {
  background-position: center top;
  background-size: cover;
  position: relative;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
      -ms-flex-direction: row;
          flex-direction: row;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.blur {
  width: 20vw;
  height: 20vw;
  -webkit-backdrop-filter: blur(20px);
          backdrop-filter: blur(20px);
  border: 2px solid white;
}

#one {
  background-color: blue;
  background-image: url("blue.jpg");
}

#two {
  background-color: green;
  background-image: url("green.png");
}

#three {
  grid-column: 1/-1;
  height: 300vh;
  background-color: #0A2119;
  z-index: 1;
}

.background {
  z-index: -1;
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 100vh;
  background-image: url("new.png");
  -webkit-filter: grayscale(100%);
          filter: grayscale(100%);
  background-size: cover;
  background-position: center top;
  -webkit-mask-image: -webkit-gradient(linear, left top, left bottom, from(rgba(10, 33, 25, 0)), color-stop(20%, rgba(10, 33, 25, 0.05)), color-stop(60%, rgba(10, 33, 25, 0.05)), to(rgba(10, 33, 25, 0)));
  -webkit-mask-image: linear-gradient(-180deg, rgba(10, 33, 25, 0) 0%, rgba(10, 33, 25, 0.05) 20%, rgba(10, 33, 25, 0.05) 60%, rgba(10, 33, 25, 0) 100%);
          mask-image: -webkit-gradient(linear, left top, left bottom, from(rgba(10, 33, 25, 0)), color-stop(20%, rgba(10, 33, 25, 0.05)), color-stop(60%, rgba(10, 33, 25, 0.05)), to(rgba(10, 33, 25, 0)));
          mask-image: linear-gradient(-180deg, rgba(10, 33, 25, 0) 0%, rgba(10, 33, 25, 0.05) 20%, rgba(10, 33, 25, 0.05) 60%, rgba(10, 33, 25, 0) 100%);
}

.nav {
  width: 100%;
  height: 8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  -webkit-backdrop-filter: blur(0.5rem);
          backdrop-filter: blur(0.5rem);
  background-color: rgba(255, 255, 255, 0.1);
}