html, body {
    height: 100%;
}

.min-100 {
    min-height: 100%;
}

#mapHolder {
    position: relative;
}

#mapHolder > #map {
    min-width: 100%;
    min-height: 100%;
}

#mapHolder > #buttonDisplayClosest {
    display: inline-block;
    position: absolute;
    left: 50%;
    transform: translate(-50%, 0);
    bottom: 30px;
    padding: 10px 20px;
}