/* (A) USE ::BEFORE TO CREATE A LOADING SPINNER */
.dropload::before {
    content: "";
    background-image: url("../images/loading.gif");
    background-repeat: no-repeat;
    background-position: center;
}

/* (B) DIMENSIONS */
.dropload {
    max-width: 320px;
}

/* optional */
.dropload select,
.dropload::before {
    width: 100%;
    height: 40px;
}

/* (C) POSITION LOADING SPINNER OVER DROPDOWN */
.dropload {
    position: relative;
}

.dropload select {
    z-index: 1;
}

.dropload::before {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
}

/* (D) "DISABLED BY DEFAULT" */
.dropload select {
    pointer-events: none;
    opacity: 0.5;
}

/* (E) HIDE SPINNER WHEN DONE LOADING */
.done.dropload select {
    pointer-events: auto;
    opacity: 1;
}

.done.dropload::before {
    display: none;
}