.popup {
    width: 100%;
    height: 100%;
    display: none;
    position: fixed;
    top: 0px;
    left: 0px;
    background: rgba(0, 0, 0, 0.75);
}

.popup {
    text-align: center;
}

    .popup:before {
        content: '';
        display: inline-block;
        height: 100%;
        margin-right: -4px;
        vertical-align: middle;
    }

.popup-inner {
    display: inline-block;
    text-align: left;
    vertical-align: middle;
    position: relative;
    max-width: 700px;
    width: 90%;
    padding: 40px;
    box-shadow: 0px 2px 6px rgba(0, 0, 0, 1);
    border-radius: 3px;
    background: #fff;
    text-align: center;
}

    .popup-inner h1 {
        font-family: 'Roboto Slab', serif;
        font-weight: 700;
    }

    .popup-inner p {
        font-size: 24px;
        font-weight: 400;
    }

.popup-close {
    width: 34px;
    height: 34px;
    padding-top: 4px;
    display: inline-block;
    position: absolute;
    top: 20px;
    right: 20px;
    -webkit-transform: translate(50%, -50%);
    transform: translate(50%, -50%);
    border-radius: 100%;
    background: transparent;
    border: solid 4px #808080;
}

    .popup-close:after,
    .popup-close:before {
        content: "";
        position: absolute;
        top: 11px;
        left: 5px;
        height: 4px;
        width: 16px;
        border-radius: 30px;
        background: #808080;
        -webkit-transform: rotate(45deg);
        transform: rotate(45deg);
    }

    .popup-close:after {
        -webkit-transform: rotate(-45deg);
        transform: rotate(-45deg);
    }

    .popup-close:hover {
        -webkit-transform: translate(50%, -50%) rotate(180deg);
        transform: translate(50%, -50%) rotate(180deg);
        background: #f00;
        text-decoration: none;
        border-color: #f00;
    }

        .popup-close:hover:after,
        .popup-close:hover:before {
            background: #fff;
        }