h1 {
        color: darkblue;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 400%;
    }
    body {
        background-color: aqua
    }
    header .leave {
        display: flex;
        justify-content: right;
        align-items: center;
    }
    header .leave a { 
        text-align: center;
        background-color: aquamarine;
        color:rgb(0, 0, 0);
        text-decoration: none;
        padding: 10px;
        border: 2px dashed rgba(0, 0, 0, 0.436);
    }

    header a:hover {
        border: 2px solid rgba(0, 0, 0, 0.436);
    }