table[id="thtbl"]{
    font-family: Arial;
    font-size: 24px;
    font-weight: 300;
}   
table[id="thtbl"] th{
    background-color: #ac1b1b;
    color: white;
}

table[id="thtbl"] th,td{        
    font-size: 24px;
    font-weight: 300;
}
.giai0{
    font-family: Arial;
    font-size: 50px;
    font-weight: 700;
    color: maroon;
}
.giai8{
    font-family: Arial;
    font-size: 45px;
    font-weight: 700;
    color: maroon;
}
table[id="thtbl"] td>span{
    cursor: pointer; 
}
table[id="thtbl"] td>span:hover{
    background-color: #fb7777; 
}