#drop-area {
        width: 100%;
        height: 100px;
        border: 2px dashed #ccc;
        border-radius: 10px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-family: Arial, sans-serif;
        color: #aaa;
        cursor: pointer;
    }

    #drop-area.highlight {
        border-color: #00bfff;
    }

    #fileElem {
        display: none;
    }