.leaflet-control-fullscreen a {
    background: #fff url('https://cooperative.obs.cn-east-3.myhuaweicloud.com/pc/fullscreen.png') no-repeat 0 0;
    background-size: 26px 52px;
}

.leaflet-touch .leaflet-control-fullscreen a {
    background-position: 2px 2px;
}

.leaflet-fullscreen-on .leaflet-control-fullscreen a {
    background-position: 0 -26px;
}

.leaflet-touch.leaflet-fullscreen-on .leaflet-control-fullscreen a {
    background-position: 2px -24px;
}

/* Do not combine these two rules; IE will break. */
.leaflet-container:-webkit-full-screen {
    width: 100% !important;
    height: 100% !important;
}

.leaflet-container.leaflet-fullscreen-on {
    width: 100% !important;
    height: 100% !important;
}

.leaflet-pseudo-fullscreen {
    position: fixed !important;
    width: 100% !important;
    height: 100% !important;
    top: 0 !important;
    left: 0 !important;
    z-index: 99999;
}

@media (-webkit-min-device-pixel-ratio:2),
(min-resolution:192dpi) {
    .leaflet-control-fullscreen a {
        background-image: url('https://cooperative.obs.cn-east-3.myhuaweicloud.com/pc/fullscreen%402x.png');
    }
}