.thishidden {
    height: 0px;
    width: 0px;
    left: -10px;
    visibility: hidden;
    position: fixed;
}
.thiserror {
    margin-top: 0px;
    font-size: small;
    color: firebrick;
    display: block;
}
.exam_input {
    background-color: antiquewhite!important;
    font-weight: bold;
    text-align: center;
    width: 50px;
    height: 20px!important;
}