.drop_zone {
    outline: 1px solid orange;
}

.loader {
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 120px;
    height: 120px;
    animation: spin 2s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Remove default bullets */
ul, .tree {
    list-style-type: none;
}

/* Style the caret/arrow */
.tree-caret {
    cursor: pointer;
    user-select: none; /* Prevent text selection */
}

.objTree-label {
    cursor: pointer;
}

/* Create the caret/arrow with a unicode, and style it */
.tree-caret::before {
    content: "\25B6";
    color: black;
    display: inline-block;
    margin-right: 6px;
}

.objTree-leaf::before {
    content: "\25C6";
    color: black;
    display: inline-block;
    margin-right: 6px;
}

/* Rotate the caret/arrow icon when clicked on (using JavaScript) */
.tree-caret-down::before {
    transform: rotate(90deg);
}