.table-user-thumb {
    width: 30px;
    height: 30px;
    border-radius: 50%;
}
 input[type='radio']:checked:after {
     width: 15px;
     height: 15px;
     border-radius: 15px;
     top: -2px;
     left: -1px;
     position: relative;
     background-color: #212529;
     content: '';
     display: inline-block;
     visibility: visible;
     border: 2px solid white;
 }