app.css

.left_header {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    border-radius: 15px;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.left_header img {
    max-width: 200px;
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.left_header img:hover {
    transform: scale(1.05);
}

.left_header h1 {
    color: white;
    font-size: 2rem;
    font-weight: 600;
    margin: 0;
}

.right_panel {
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    height: 100%;
}

.render_header {
    background: #f3f4f6;
    padding: 12px;
    border-radius: 15px 15px 0 0;
    display: flex;
    gap: 8px;
}

.header_btn {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.header_btn:nth-child(1) { background: #ef4444; }
.header_btn:nth-child(2) { background: #f59e0b; }
.header_btn:nth-child(3) { background: #10b981; }

.html_content {
    height: calc(100vh - 180px);
    overflow: auto;
    padding: 20px;
}

.right_content {
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    height: calc(100vh - 180px);
}

/* Mobile Responsive Design */
@media (max-width: 768px) {
    .left_header {
        padding: 1.5rem;
    }
    
    .left_header img {
        max-width: 150px;
    }
    
    .left_header h1 {
        font-size: 1.5rem;
    }
    
    .html_content {
        height: calc(100vh - 140px);
    }
}