#calibrate_zone
{
    display: flex;
    flex-direction: column;
    border-style: inset;
    border-width: 8px;
    border-color: chartreuse;
    font-size:26px;
    align-items: center;
    align-content: center;
    justify-content: center;
}

p
{
    font-size:26px;
}
h2 h3
{
    font-size:inherit;
    text-align: center;
}

progress
{
    color:green;
    background-color: aliceblue;
}
progress:indeterminate
{
    background-color: black;;
    color:yellow;
}