.dropbtn {
	background-color: #ccc;
	border-radius: 0.5em 0.5em 0 0;
	color: black;
	text-decoration: none;
	padding: 16px;
	width: 120px;
	font-size: 16px;
	border: none;
	cursor: pointer;
}

.dropbtn_corrected_va {
	background-color: #ccc;
	border-radius: 0.5em 0.5em 0 0;
	color: black;
	text-decoration: none;
	padding: 16px 26px 16px 26px;
	width: 120px;
	font-size: 16px;
	border: none;
	cursor: pointer;
}

.dropbtn_active {
	background-color: #ccc;
	border-radius: 0.5em 0.5em 0 0;
	color: black;
	text-decoration: none;
	padding: 16px;
	width: 120px;
	font-size: 16px;
	border: none;
	cursor: pointer;
}

.content {
	width: 100%;
	/* height: 80%; */
	/* border: 1px solid red; */
}
.dropdown {
	position: relative;
	display: inline-block;
}

.dropdown-content {
	display: none;
	position: absolute;
	background-color: #ddd;
	min-width: 150px;
	box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
	z-index: 1;
	top:34px;
}

.dropdown-content a {
	color: black;
	padding: 10px 10px;
	width: 200px;
	cursor: pointer;
	text-decoration: none;
	display: block;
	top: 30px;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover .dropdown-content {
	display: block;
}

.dropdown:hover .dropbtn_corrected_va {
	background-color: #fff;
	border-radius: 0.5em 0.5em 0 0;
	border: 1px solid #ccc;
	padding: 15px 25px 15px 25px;
	width: 120px;
	font-size: 16px;
}

.dropdown:hover .dropbtn {
	background-color: #fff;
	border-radius: 0.5em 0.5em 0 0;
	border: 1px solid #ccc;
	padding: 15px;
	width: 120px;
	font-size: 16px;
}


.dropdown:hover .dropbtn_corrected_va {
	color: #000;
}
.dropdown:hover .dropbtn_active {
	color: #000;
}


/* Style the tab */
.tab {
	overflow: hidden;
	border: none;
	
	background-color: #fff;
  }
  
  /* Style the buttons inside the tab */
  .tab button {
	background-color: inherit;
	float: left;
	border-style: 1 1 0 1;
	border-color: red;
	border-radius: 0.5em 0.5em 0 0;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	transition: 0.3s;
	font-size: 17px;
  }
  
  .tab .demographics {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .biometry {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .iop {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .refraction {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .cylinder {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .uncorrected_va {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .uncorrected_va_cum {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .corrected_va {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .corrected_va_cum {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .cs {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .defocus {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .rotation {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }
  .tab .halo_glare {
	background-color: #eee;
	float: left;
	border: 1px solid #ddd;
	border-radius: 0.5em 0.5em 0 0;
	text-decoration: none;
	outline: none;
	cursor: pointer;
	padding: 14px 16px;
	margin: 0.2em 0.2em 0 0;
	transition: 0.3s;
	font-size: 17px;
	height: 74px;
  }


  /* Change background color of buttons on hover */
  .dropbtn:hover {
	color: #000;
	background-color: rgb(31, 61, 102);
  }
  
  /* Create an active/current tablink class */
  .tab .demographics:active {
	background-color: #ccc;
	border: 1px 1px 0 0;
  }
  .tab .demographics:visited {
	background-color: #ccc;
	border: 1px solid #ff0;
  }
  .tab .demographics:link {
	background-color: #ccc;
	border: 1px solid #0f0;
  }
  
  /* Style the tab content */
  .tabcontent {
	display: block;
	padding: 6px 12px;
	border: 1px solid #ccc;
	border-top: none;
  }
  #tabcontent {
	background-color: white;
	border: 1px solid #ddd; 
	margin-top: 15px;
	padding: 1em;
  }