@media  (max-width: 500px) {
    .overlay {
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(0, 0, 0, 0.7);
        transition: opacity 500ms;
        visibility: hidden;
        opacity: 0;
    }

    .overlay:target {
        visibility: visible;
        opacity: 1;
    }

    #popupBody{
        width: 90%;
        padding: 2%;
        border-radius: 15px;
        box-shadow: 0 0 5px #CCC;
        background: #FFF;
        position: relative;
        margin: 20% auto;
        transition: all 1s ease-in-out;
    }

    #close {
        position: absolute;
        top: 20px;
        right: 30px;
        font-size: 30px;
        font-weight: bold;
        text-decoration: none;
        color: #F00;
        transition: all 200ms;
    }
}