.sortable-list { 
    list-style-type: none; 
    padding: 0;
    min-height: 300px;
    border: 1px dashed #ccc;
    padding: 10px;
}
.sortable-list li { 
    margin: 5px; 
    padding: 10px; 
    background: #f0f0f0; 
    cursor: move;
    border-radius: 5px;
}
#sortable li.ui-sortable-helper {
    background: #e0e0e0;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
}
.correct { background: #cfc !important; }
.incorrect { background: #fcc !important; }
.arrow {
    position: absolute;
    color: red;
    font-size: 24px;
    font-weight: bold;
    z-index: 1000;
    transition: all 0.5s ease-in-out;
}