* {
    margin: 0;
    font-family: Arial;
}

nav {
    position: absolute;
    top: -50px;
    right: 0;
}

nav ul {
    display: flex;
    justify-content: flex-end;
    padding: 0;
    list-style-type: none;
}

nav ul li {
    border-left: 1px;
    border-right: 1px;
    border-left-style: solid;
    border-right-style: solid;
    border-color: black;
}

nav ul li:first-of-type {
    border-left-style: none;
}

nav ul li:last-of-type {
    border-right-style: none;
}

nav ul li a {
    display: grid;
    place-content: center;
    height: 50px;
    padding: 0 15px;
    text-decoration: none;
    background-color: aqua;
    color: black;
}

header {
    position: relative;
    width: 1000px;
    height: 150px;
    margin: 200px auto;
    padding: 50px;
    background-color: blueviolet;
}

h1 {
    text-align: center;
}