.validity {
    width: 100vw;
    height: 100vh;
    position: fixed;
    left: 0px;
    top: 0px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.5);
    z-index: 100000;
}
.validity div{color:yellow;font-weight:bold;font-size:24px;padding:10px;text-align:center;}
@media only screen and (max-width:680px) {
    .validity div{color:yellow;font-weight:bold;font-size:12px;padding:10px;text-align:center;}
}