* {
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, Helvetica, sans-serif;
        background-color: rgba(63, 63, 63, 1);
}

header {
    width: 100%;
    height: 110px;
    background-color: black;
    opacity: 0,7;
    outline: 5px solid #eab600;
}


nav {
    width: 1100px;
    height: 170px;
    float: right;
    font-size: 35px;

}

    nav ul {
        list-style-type: none;
        margin-left: 250px;
    }

    nav li {
        float: left;
    }

    nav a {
        display: block;
        color: white;
        text-decoration: none;
        border: 1px solid #000;
        padding: 30px 50px;
        background-color: black;
        -webkit-border-radius: 15px 15px 15px 15px;
        border-radius: 15px 15px 15px 15px;
    }

        nav a:hover {
            background-color: lightgrey;
        }
    nav li:hover ul {
        display: block;
    }