.hidden
{
    display: none;
}

.red
{
    color: red;
}



.loading-mask
{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;

    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
}

.loading-mask > .spinner-border
{
    position: fixed;
    top: 48.8%;
    left: 48.8%;
}

.content-box
{
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

    width: 600px;
    height: 400px;
    border: 1px solid darkgray;
    border-radius: 8px;
    
    padding: 60px;
}

.content-box > div:not(:first-child)
{
    margin-top: 8px;
}

.result-box
{
    width: 600px;
    border: 1px solid darkgray;
    border-radius: 8px;
    
    margin: 120px auto 0 auto;
    padding: 60px;
}