html,
body {
    font-family:Tahoma, Arial, Verdana;
    text-align: center;
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
    color:black;
}

header {
    padding: 15px;
    background: #ffffff;
}

footer {
    padding: 15px;
    background: #333;
    color: #fff;
}
footer a {
    color: white;
    text-decoration: underline;
}


.botaospinner {
    color:darkgreen;
}