.topmodal {
    background: #fff;
    box-sizing: border-box;
    display: none;
    position: relative;
    padding: 20px;
    max-width: 500px;
    width: 100%;
    vertical-align: middle;
    z-index: 10000;
}

.topmodal.is-open {
    display: inline-block;
}

.topmodal-overlay {
    background: rgba(0, 0, 0, 0.5);
    display: none;
    position: fixed;
    top: -100%;
    bottom: -100%;
    left: -100%;
    right: -100%;
    cursor: pointer;
}

.topmodal-overlay.is-open {
    display: block;
    z-index: 9999;
}

.topmodal-container {
    box-sizing: border-box;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10000;
    width: 100%;
    height: 100%;
    display: none;
    text-align: center;
    overflow: auto;
    padding: 10px 10px 0;
}

.topmodal-container.is-open {
    display: block;
}

.topmodal-container:after {
    content: '';
    display: inline-block;
    margin-left: -.05em;
    height: 100%;
    vertical-align: middle;
}