.window{
    width :max-content;
    height: 100px;
    position: absolute;
    border: 1px solid #000;
    border-radius: 5px;
    overflow: hidden;
}
.window-titlebar{
    width: calc(100% - 20px);
    height: 40px;
    background-color: #393939;
    color: #fff;
    display: flex;
    align-items: center;
    padding: 0 10px;
    cursor: grab;
    user-select: none;
}