.menu {
  position: -webkit-sticky;
  position: sticky;
  text-align: center;
  top: 0;
  z-index: 1;
  background-color: rgba(255,255,255,.75);
}
.me_a {
  position: static;
  width: 15%;
  height: 5vh;
}
.me_b {
  position: static;
  width: 15%;
  height: 5vh;
}
.me_c {
  position: static;
  width: 15%;
  height: 5vh;
}
.me_d {
  position: static;
  width: 15%;
  height: 5vh;
}
.me_e {
  position: static;
  width: 15%;
  height: 5vh;
}
.fr_one {
  position: relative;
  width: 100%;
  height: 100%;
}
._inf_1 {
  left: 0;
  top: 0;
  width: 100%;
  height: 90vh;
  border-width: 0;
}
.fr_two {
  position: relative;
  width: 100%;
  height: 100%;
}
._inf_2 {
  left: 0;
  top: 0;
  width: 100%;
  height: 90vh;
  border-width: 0;
}
.fr_three {
  position: relative;
  width: 100%;
  height: 100%;
}
._inf_3 {
  left: 0;
  bottom: 0;
  width: 100%;
  height: 10vh;
  border-width: 0;
  text-align: center;
}
.fr_four {
  position: relative;
  width: 100%;
  height: 100%;
}