.flag:after {
    content: "UNIKLTAG{1t_1s_t00_d4rk}";
    color: black;
 }

 .flag1:after {
    content: "Submit flag here";
    display: inline-block;
    padding: 10px 20px;
    border-radius: 4px;
    text-decoration: none;
    color: #000;
    font-weight: 600;
    font-size: 14px;
    margin-top: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, .2);
 }