body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f0f0f0;
}

.header {
    background: #202124;
    color: white;
    padding: 12px;
    display: flex;
    justify-content: space-between;
}

#tabs {
    padding: 10px;
    background: #ddd;
    border-bottom: 1px solid #bbb;
}

.tab-btn {
    margin-right: 5px;
    padding: 6px 10px;
    border: none;
    background: #bbb;
    border-radius: 4px;
    cursor: pointer;
}

.tab-btn.active {
    background: #4caf50;
    color: white;
}

#editor {
    width: 100%;
    height: calc(100vh - 150px);
    padding: 12px;
    font-size: 16px;
}