.content-overflow-y {
    overflow-y: auto;
}

.unusable-link {
    pointer-events: none;
    cursor: not-allowed;
    color: gray !important;
    text-decoration: none !important;
}

.loading-mask {
    position: fixed;
    z-index: 10000000;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: none;
}

.loading-mask>img {
    width: 100px;
    height: 100px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -50px;
    margin-left: -50px;
}

/* error page */
.error-container {
    margin: 100px 0;
    text-align: center;
}
.error-container>h1 {
    margin: 60px 0;
}