#map {
    width: 100%;
    height: 100%;
}

.custom-marker {
    width: 25px;
    height: 41px;
    position: relative;
}

.custom-marker svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}