.bttn{cursor: pointer}
.center{margin: 0 auto; display: block; width: auto; text-align: center;}
.clear{clear: both}
.centertext{
    display: block;
    width: 100%;
    text-align: center;
}

.flex{display: flex}

.hidden{display: none}

.transparent{
    opacity: 0;
}

.justifytxt{
    text-align: justify;
}

.middle{
    display: flex;
    align-items: center;
    justify-content: center;
    width: inherit;
    height: inherit;
}