icingaweb2/public/css/main.css

body { padding-top: 70px; }

.load-indicator .mask {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: #666;
    opacity: 0.3;
    z-index: 998;
}

.load-indicator .label {
    position: absolute;
    top: 0;
    left: 0;
    color: #000;
    background-color: #fff;
    font-weight: normal;
    z-index: 999;
    border: none;
}