html, body {
    height: 100%;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 80%;
}

.msg {
    font-size: 30px;
    color: #fff;
    text-align: center;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6);
}

.key-details {
    text-align: center;

    padding: 20px;
    background-color: #737272;
    border-radius: 10px;
    margin: 20px;

    color: #fff;
    font-size: 20px;
    line-height: 1.4;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    border: solid 1px dimgrey;
}

span {
    columns: 2;
}