#header{
   
    text-align: center;
   min-height: 50px; width: 100%;
    margin: auto;
    background-color: wheat;
    margin-bottom: 10px;
}
#menu{
    display: flex; background: pink;
      min-height: 50px; width: 100%;
      justify-content: center;
align-items: center;
  gap: 40px;
   position: fixed;  z-index: 1000; top: 0; left: 50%; transform: translateX(-50%);
   
}
#menu div a {
    display: block; padding: 10px 20px;
     text-decoration: none;
     font-weight: bold;color: brown;
}
#header{ padding-top: 70px; margin-left: auto; margin-right: auto; margin-bottom: 40px;}

#content .dataitems {margin-top: 15px;  height: 1200px;}
body{
    background-color: aqua;
}