.button-group button  { background-color: #3ca6fe; border-radius: 10px; height: 30px;
                        width: 180px; margin:5px 15px 5px; border: 2px solid #3ca6fe; color: white;}
.mf-title .title    { margin-left: calc(40% - 340px); font-size: 38px; color:#17acc2; width: 450px; 
                      border:0;}
@media (max-width: 880px){
  .mf-title .mark     { display: none; }
  .mf-title .title    { margin-left: 0;  }
  .mf-title           { text-align: center; }
}