.lightbox {
  /** Hide the lightbox */
  display: none;

  /** Apply basic lightbox styling */
  position: fixed;
  z-index: 9999;
  width: 100%;
  height: 100%;
  text-align: center;
  top: 0;
  left: 0;
  background: black;
  background: rgba(0,0,0,0.8);
}

.lightbox img {
  /** Pad the lightbox image */
  max-width: 90%;
  max-height: 80%;
  margin-top: 2%;
}

.lightbox:target {
  /** Show lightbox when it is target */
  display: block;

  /** Remove default browser outline style */
  outline: none;
}

.float_box
{
	height: 290px;
	width: 500px;
	background-color: #fff;
	position: absolute;
	top: 50%;
    left: 50%;
	margin: -200px 0 0 -250px;
	font-size: 0.9em;
}

.slide
{
	margin: 18px;
	text-align: left;
	color: #000;
}

.slide_close
{
	position: absolute;
	background-color: #ddd;
	padding: 10px 14px 10px 14px;
	left: 480px;
	top: -15px;
	border-radius: 50px;
	font-size: 1.2em;
	font-family: Arial, Helvetica, sans-serif;
}

.slide_close:hover
{
	background-color: #999;
}

.slide_1_image
{
	float: right;
	height: 160px;
	width: 280px;
	background-color: black;
	margin: 0px 10px 10px 10px;
	background-image: url(../images/Hypertension-842157212.jpg);
	background-repeat: no-repeat;
	background-size: cover;
}

.slide_2a_image
{
	display: inline-block;
	background-image: url(../images/thyroid1-.png);
	height: 140px;
	width: 140px;
	background-repeat: no-repeat;
	background-size: cover;
}

.slide_2b_image
{
	display: inline-block;
	background-image: url(../images/thyroid1.png);
	height: 140px;
	width: 140px;
	background-repeat: no-repeat;
	background-size: cover;
}

.slide_video
{
	background-image: url(../images/redBloodCells-smallv1.mp4);
	margin: 10px auto;
	height: 150px;
	width: 270px;
	background-color: aquamarine;
}

.slide_4_image
{
	margin: 0 auto;
	height: 120px;
	width: 470px;
	background-image: url(../images/Athletic-536852469.jpg);
	background-repeat: no-repeat;
	background-size: contain;
}