table, th, td{
    border: 1px solid black;
    border-radius: 3px;
    text-align: center;
}
table{
    margin: 10px;
    height: 500px;
    width: 350px;
    
}
.cim{
    text-indent: 20px;
    padding: 0px;
    margin: 5px;
}
caption{
    text-align: center;
     caption-side: bottom;
     font-weight: bolder;
     border: 2px solid black;
     border-radius: 3px;
     background-color: burlywood;
}
body{
    background-image: none;
    background-color: rgb(221, 225, 225);
}
tr:nth-child(odd){
    background-color: white;
}
tr:nth-child(even){
    background-color: beige;
}
.easy:hover{
    background-color: greenyellow;
    opacity: 0.7;
}
.medium:hover{
    background-color: darkorange;
    opacity: 0.7;
}
.hard:hover{
    background-color: red;
    opacity: 0.8;
}
.extreme:hover{
    background-color: rgb(131, 13, 37);
}