.overlay {
    width: 100%;
    position: fixed;
    top: 0%;
    background: rgba(0,0,0,0.5);
    height: 100vh;
    z-index: -1;
    opacity: 0;
    transition: 1s;
}

.Otp-Form {
    width: 400px;
    padding: 30px 20px;
    background-color: beige;
    position: absolute;
    left: 50%;
    top: -50%;
    transform: translate(-50%,-50%);
    box-shadow: 0px 0px 10px 3px #ccc;
    transition: 2s;
}

    .Otp-Form span {
        position: absolute;
        right: 0;
        top: 0;
        height: 20px;
        width: 20px;
        text-align: center;
        background-color: red;
        color: white;
        line-height: 20px;
        cursor: pointer;
    }

.showOverlay {
    opacity: 1;
    z-index: 1;
    margin-left: -51%;
}

.showLogin {
    top: 50%;
    z-index: 9;
}

@media (max-width: 767.98px) {
    .showOverlay {
        margin-left: -7%;
    }
}