html {
  background-color: black;
  height: 100%;
}

body {
  height: 100%;
  margin: 0;
}

.main {
  background-size: cover;
  background-position: 50% 50%;
  width: 100%;
  height: 100%;
  cursor: move;
}

/* Buttons */

.float {
  position: fixed;
  bottom: 20px;
  width: 80px;
  height: 80px;
  background-color: rgb(0, 0, 0, 0.3);
  color: #fff;
  border-radius: 50px;
  text-align: center;
  text-decoration: none;
  font-family: sans-serif;
  font-size: 18px;
  /*border: 1px solid rgb(255, 255, 255);*/
  border: 1px solid rgba(255, 255, 255, 0.3);
  -webkit-background-clip: padding-box;
  background-clip: padding-box;
}

.left-float {
  left: 20px;
}

.middle-float {
  left: calc(50% - 40px);
}

.right-float {
  right: 20px;
}

.my-float {
  height: 18px;
  margin-top: calc(50% - 9px);
}