.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, .objTree-subtree { list-style-type: none; } /* Style the caret/arrow */ .objTree-caret { cursor: pointer; user-select: none; /* Prevent text selection */ } .objTree-label { cursor: pointer; } /* Create the caret/arrow with a unicode, and style it */ .objTree-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) */ .objTree-caret-down::before { transform: rotate(90deg); }