body {
    width:100%;
    overflow-x:hidden;
}
.td_normal {
    height: 5rem;
    line-height: 5rem;
    font-size: 2rem;
    text-align: center;
    border: solid 1px #eee;
    vertical-align: middle !important;
}
.td_random {
    background-color:#ddd;
    color:unset;
}
.td_selected {
    background-color:darkorange;
    color:white;
}
.table {
    border:0;
}
.div_parent {
    width:100%;
}
.div_button {
    width:100%;
    text-align:center;
}
.btn_random {
    width:10rem;
}