fixed navigation menu

1.navigation {
2   /* fixed keyword is fine too */
3   position: sticky;
4   top: 0;
5   z-index: 100;
6   /* z-index works pretty much like a layer:
7   the higher the z-index value, the greater
8   it will allow the navigation tag to stay on top
9   of other tags */
10}

1* {
2  margin: 0;
3  padding: 0;
4  box-sizing: border-box;
5}
6
7body {
8  height: 1200px;
9  font-size: 18px;
10  font-family: sans-serif;
11  color: #5D6063;
12}
13
14a:link,
15a:visited {
16  color: #5D6063;
17  text-decoration: none;
18}
19a:hover {
20  text-decoration: underline;
21}
22
23.header {
24  position: fixed;
25  display: flex;
26  justify-content: space-between;
27  
28  width: 100%;
29  padding: 50px;
30  background: #D6E9FE;
31}
32