CODE EXAMPLE FOR CSS

change d in path svg css

#map_outer svg path {
    d: path('M 850 300 C 850 300 350 300 350 300 L 348.1 205.39 L 120 400.39 L 348.1 606.19 L 350 500 C 850 500 850 500 850 500 z') !important;
}