* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

html,
body {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.page,
#invalidPanel {
    left: 0;
    top: 0;
    display: none;
    flex-direction: column;
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: absolute;
}