.button_ellipse {
    background-color: black !important;
    border: none !important;
    color: white !important;
    padding: 2px 20px !important;
    text-align: center !important;
    text-decoration: none !important;
    display: inline-block !important;
    margin: 4px 2px !important;
    cursor: pointer !important;
    border-radius: 20px !important;
    vertical-align: middle !important;
    display: inline !important;
}

    .button_ellipse:hover {
        background-color: lightgrey !important;
        color: black !important;
    }