body {
    margin: 0;
}

header {
    background-color: #67a8e2;
    display: flex;
}

    header h1 {
        font-family: Arial;
        font-weight: 400;
        font-size: 30px;
        align-items: center;
        margin-left: 20px;
        width: 60%;
    }

        header h1 a {
            text-decoration: none;
            color: black;
        }

    header ul {
        font-size: 20px;
        list-style: none;
        display: inherit;
        padding-top: 10px;
        width: 60%;
        margin-right: 20px;
        text-align: right;
        justify-content: right;
    }

        header ul li {
            margin: 0 5px;
        }

            header ul li a {
                text-decoration: none;
                color: black;
                margin-left: 3px;
                margin-right: 3px;
            }

                header ul li a:hover, a:focus {
                    background-color: #302ce1;
                    color: white;
                }

#screen {
    margin: 0 4px;
    border-right: 1px solid #ffffff;
    border-left: 1px solid #666;
}