.about-us {
    z-index: 100;
    min-height: 100vh;
    position: relative;
}
.about-us img{
    max-width: 100%;
}
#map-canvas {
    min-height: 90vh;
    position: absolute;
    top: 0;
    bottom: -100px;
    left: 0;
    right: 0;
    z-index: -1;
}