.img-20kb-box {
    max-width: 750px;
    margin: 40px auto;
    padding: 25px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    text-align: center;
    font-family: Arial, sans-serif;
}

.upload-area {
    border: 2px dashed #e74c3c;
    padding: 35px;
    margin: 20px 0;
    cursor: pointer;
    border-radius: 10px;
    color: #555;
}

.upload-area:hover {
    background: #fff5f5;
}

.upload-area input {
    display: none;
}

.preview-box img {
    max-width: 100%;
    margin: 15px 0;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#resize20Btn {
    padding: 12px 30px;
    background: #e74c3c;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

#resize20Btn:hover {
    background: #c0392b;
}

#previewArea20 img {
    max-width: 100%;
    margin-top: 20px;
    border-radius: 10px;
}

#downloadBtn20 {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 22px;
    background: #27ae60;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
}

.tool-credit {
    margin-top: 25px;
    padding-top: 10px;
    border-top: 1px dashed #ddd;
    font-size: 14px;
    color: #666;
}