body {
    font-family: Arial;
    margin: 0;
    background-color: white;
	text-align: left;
}

nav a {
	display: inline-block;
	padding: 10px 20px;
	background-color: black;
	color: white;
	text-decoration: none;
	border-radius: 5px;
	margin-right: 10px
	font-size: 14px;
}
nav {
	text-align: center;
}
header {
	background-color:navy blue;
	color: white
	text-align: center;
	width: 100%;
}
img {
    vertical-align: top;
}
.tx {
   vertical-align: top;
   width: 100%;
}
.hdr_img{
	display: block;
  margin: auto;
  width: 100%;
}

section {
    border: 2px solid black;             
    width: 300px;
	width: 100%;
    display: block;
}
.cls_dm {
margin: 0;
    padding-left: 200px;
    padding-right: 200px;
}
nav a {
	display: inline-block;
	padding: 10px 20px;
	background-color: black;
	color: white;
	text-decoration: none;
	border-radius: 5px;
}
.img_DT {
	    text-align: center;
}