html {
  font-family: "Roboto", "sans-serif";
  font-size: 16px;
  z-index: 0;
  transition: backround-color ease 4s;
}

.modal {
  position: fixed;
  text-align: center;
  background: rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100vh;
  opacity: 1;
  visibility: visible;
  transition: opacity ease 0.7s;
}

.disable {
  opacity: 0;
}

.cross {
  position: absolute;
  left: 92%;
  bottom: 92%;
}

.cross:hover {
  cursor: pointer;
}

.instructions {
  background: white;
  position: relative;
  z-index: 1;
  line-height: 1.4;
  width: 370px;
  height: 450px;
  border-top: 9px solid rgb(159, 216, 162);
  /* border-radius: 5%; */
  padding: 1% 3%;
  top: 100px;
  left: 50%;
  transform: translate(-50%, 0);
  opacity: 1;
  transition: opacity ease 0.5s;
}

.instructions ul {
  opacity: 0.7;
  list-style-type: initial;
  font-size: 1.1em;
  margin: 10px;
  padding: 10px;
  line-height: 25px;
  border-top: 1px solid rgba(0, 0, 0, 0.205);

}


.navbar {
  background-color: rgb(159, 216, 162);
  color: white;
  list-style-type: none;
  margin: 0px;
  padding: 0px;
  z-index: -1;
  overflow: hidden;
}

li {
  float: left;
}

.btn {
  display: block;
  font-size: 1.5em;
  text-align: center;
  padding: 17px 16px;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  background: rgb(196, 193, 193);
  color: white;
  
}

.btn-start {
  border-left: 2px solid white;
  color: white;
  display: block;
  font-size: 1.5em;
  text-align: center;
  padding: 17px 16px;
  text-decoration: none;
  cursor: pointer;
  visibility: hidden;
}

.btn-start:hover {
  background: rgb(196, 193, 193);
  color:white;
}

.active {
  background: rgb(196, 193, 193);
  color:white;
}


.select-tag {
  background-color: rgb(196, 193, 193);
  color: white;
  border-left: 2px solid white;
  display: block;
  font-size: 1.5em;
  text-align: center;
  padding: 17px 10px 17px 16px;
  text-decoration: none;
}

.navbar-bottom {
  background-color: rgb(159, 216, 162);
  list-style-type: none;
  margin: 0px;
  padding: 0px;
  overflow: hidden;
  position: fixed;
  bottom: 0;
  width: 100%;
  z-index: -1;
}

.slider {
  background-color: rgb(196, 193, 193);
  color: white;
  border-left: 2px solid white;
  display: block;
  font-size: 1.5em;
  text-align: center;
  padding: 17px 10px 17px 16px;
  text-decoration: none;
  cursor: pointer;
}

.visualization-field {
  position: relative;
  left: 50%;
  transform: translate(-50%, 0);
  height: 70vh;
  overflow: hidden;
  z-index: -1;
}

.vertical-bar {
  border-left: 6px solid black;
  float: left;
  height: 200px;
  margin: 1px;
  position: relative;
}