body {
	margin: 0;
	padding: 0;
	background-image: url('../images/background.png');
font-size: 120%;
}


.hidenrz {
  display: none;
}

.nrz:hover + .hidenrz {
  display: block;

}
.hiderz {
  display: none;
}

.rz:hover + .hiderz {
  display: block;
}





#home {
background-image: url("../images/backDiv1.jpg");
height: 100vh;
width: 100vh;
}
#introduction {
background-image: url("../images/backDiv1.jpg");
height: 100vh;
width: 100vh;
}#experiment {
background-image: url("../images/backDiv1.jpg");
height: 100vh;
width: 100vh;
}
.button {
  background-color: #4CAF50;
  border: none;
  color: white;
  padding: 16px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  transition-duration: 0.4s;
  cursor: pointer;
}

.button1 {
  background-color: white; 
  color: black; 
  border: 2px solid #4CAF50;
}

.button1:hover {
  background-color: #4CAF50;
  color: white;
}

.button2 {
  background-color: white; 
  color: black; 
  border: 2px solid #008CBA;
}

.button2:hover {
  background-color: #008CBA;
  color: white;
}

.button3 {
  background-color: white; 
  color: black; 
  border: 2px solid #f44336;
}

.button3:hover {
  background-color: #f44336;
  color: white;
}

.button4 {
  background-color: white;
  color: black;
  border: 2px solid #e7e7e7;
}

.button4:hover {background-color: #e7e7e7;}

.button5 {
  background-color: white;
  color: black;
  border: 2px solid #555555;
}

.button5:hover {
  background-color: #555555;
  color: white;
}
.tab {
	  overflow: hidden;
	  border: 1px solid #ccc;
	  background-color: #f1f1f1;
	}

.tab button {
  background-color: inherit;
  float: left;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  transition: 0.3s;
}
.tab button:hover {
  background-color: #ddd;
}

.tab button.active {
  background-color: #ccc;
}
.tabcontent {
  display: none;
  padding: 6px 12px;
  border: 1px solid #ccc;
  border-top: none;
}
.tabcontent {
  animation: fadeEffect 1s; 
}
@keyframes fadeEffect {
  from {opacity: 0;}
  to {opacity: 1;}
}