body {
  margin: 0;
  width: 100%;
  scrollbar-base-color: #5F9FDB;
  scrollbar-3dlight-color: #C0C0C0;
  scrollbar-highlight-color: #C0C0C0;
  scrollbar-track-color: #fff;
  scrollbar-arrow-color: #fff;
  scrollbar-shadow-color: #fff;
  scrollbar-dark-shadow-color: #fff;
  scrollbar-width: 3px;
}

body::-webkit-scrollbar {
  width: 3px;
  background: transparent;
}

body::-webkit-scrollbar-thumb {
  width: 3px;
  background: #5F9FDB;
}

div{
  float: left;
}

.header {
  height: 8vh;
  width: 100%;
  text-align: center;
  line-height: 5vh;
  font-size: 3vh;
  padding: 10px;
  box-sizing: border-box;
  transition: all 0.5s ease-in-out;
  z-index: 100;
}

.header:before {
  float: left;
  content: "";
  width: 100px;
  heiht: 40px;
  background: #fff;
  position: absolute;
  content: "sticked";
  left: 10%;
  top: -40px;
  opacity: 0;
  color: #000;
  font-variant: small-caps;
  font-size: 20px;
  border-radius: 0 0 10px 10px;
  transition: all 0.5s ease-in-out;
  cursor: pointer;
}

.header.sticked {
  opacity: 0.9;
}

.header.sticked:before {
  top: 0;
  opacity: 0.6;
}

.header.sticked:hover::before {
  top: 0;
  opacity: 1;
}

.content {
  height: 120vh;
  width: 100%;
  text-align: center;
  line-height: 90vh;
  font-size: 5em;
}

.content-min {
  height: 20vh;
  width: 100%;
  text-align: center;
  font-size: 3em; 
}

.bg-1 {
  background: rgb(134, 206, 173);
}

.bg-2 {
  background: rgb(150, 206, 134);
}

.bg-3 {
    background: rgb(163, 229, 77);
}