.jimu-widget-fullScreen {
    width: 32px!important;
    height:32px!important;
    margin:2px;
}

.jimu-widget-fullScreen button.cesium-button {
    background: #fff;
    border-color: #fff;
    box-shadow: 0 0 8px #fff;
    width: 32px;
    height: 32px;
    border-radius: 14%;
    padding: 0;
    vertical-align: middle;
    z-index: 0;
}