.overlay {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.5);
    transition: all 0.5s ease-in-out;
    visibility: hidden;
    opacity: 0;
}

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

.popup {
    background: #fff;
    height: 100%;
    overflow: auto;
    position: relative;
    transition: all 0.5s ease-in-out;
    -moz-box-shadow: 1px 1px 6px #282828;
    -webkit-box-shadow: 1px 1px 6px #282828;
    box-shadow: 1px 1px 6px #282828;
}

    .popup h2 {
        margin-top: 12.5px;
        margin-left: 12.5px;
        color: #23415b;
    }

    .popup h4 {
        margin-top: 0;
        color: #23415b;
    }

    .popup .close {
        position: absolute;
        top: 20px;
        right: 30px;
        transition: all 200ms;
        font-size: 30px;
        font-weight: bold;
        text-decoration: none;
        color: #999;
    }

        .popup .close:hover {
            color: #23415b;
        }

    .popup .content {
        color: #23415b;
        text-align: justify;
    }