.iframe-surat {
    width: 100%;
    height: 650px;
    max-height: 500px;
}


.blink {
    animation: blink-animation 1s steps(5, start) infinite;
    -webkit-animation: blink-animation 1s steps(5, start) infinite;
}
@keyframes blink-animation {
    to {
        visibility: hidden;
        color: violet;
    }
}
@-webkit-keyframes blink-animation {
    to {
      visibility: hidden;
        color: violet;
    }
}