*{
    border: 0px; margin: 0px; padding: 0; box-sizing: border-box;
}
body{
    background-color: green;
    font-family: verdana;
    padding: 20px 80px;
}
h1{
    font-weight: normal;
    text-align: center;
}
nav#h_menu1 {
    border: 4px solid gray;
}
nav#h_menu1 a{
display: block;

padding: 8px 16px; 
text-decoration: inline-block;
}
nav#h_menu1 > ul > li{

margin: 4px;
display: inline-block;
position: relative;
}
nav#h_menu1 > ul{
list-style: none;
text-align: center;
}
nav#h_menu1 ul.submenu{
    position: absolute;
    top: 120%; left: 0px;
    width: 180px;
    display: none;
}
nav#h_menu1 ul.submenu li {
 background-color: hotpink;
 list-style: none;
margin: 4px;
}
nav#h_menu1 a:hover {
    background-color: #FFC;
}
nav#h_menu1 > ul > li:hover > ul.submenu {
    display: block;
}
section{
    display: flex;
    justify-content: center;
}