body {
    background-color: #000;
    color: #fff;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
}

.tab {
    display: none;
}

.tab.active {
    display: block;
}

.logo {
    margin-top: 50px;
}

.logo img {
    width: 150px;
}

.points {
    font-size: 36px;
    margin-top: 20px;
}

.tab-content {
    padding: 20px;
}

.nav-bar {
    position: fixed;
    bottom: 0;
    width: 100%;
    display: flex;
    justify-content: space-around;
    background-color: #111;
    padding: 10px 0;
}

.nav-bar button {
    background: none;
    border: none;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    flex-grow: 1;
}

.nav-bar button.active {
    color: #1E90FF;
}

.task-item {
    background-color: #222;
    padding: 15px;
    margin: 10px 0;
    border-radius: 10px;
}

.task-item button {
    background-color: #1E90FF;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.invite-button {
    background-color: #1E90FF;
    color: #fff;
    padding: 15px;
    border-radius: 5px;
    font-size: 18px;
    margin-top: 20px;
    cursor: pointer;
}