& {
    background: whitesmoke;
    border-bottom: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
    padding: 0 10px;
    .left, .right {
        display: flex;
    }
    .menu-item {
        display: flex;
        height: 35px;
        align-items: center;
        padding: 0 10px;
        color: #333;
        transition: color .3s;
        &.brand {
            font-size: 16px;
            font-weight: bold;
        }
        &:hover {
            cursor: pointer;
            color: black;
        }
    }
}

.operate-disable {
    color: #ccc;
    &:hover {
        color: #ccc;
    }
}

.size-group {
    position: relative;
    display: flex;
    margin-right: 20px;
    .slider-container {
        position: absolute;
        display: none;
        z-index: 100;
        width: 100px;
        right: -40px;
        top: 35px;
        background: white;
        border: 1px solid #ddd;
        padding: 5px 10px;
        border-bottom-right-radius: 5px;
        border-bottom-left-radius: 5px;
        .slider {
            width: 100%;
        }
    }
    .fa-mobile {
        font-size: 19px;
    }
    .fa-desktop {
        font-size: 12px;
    }
    &:hover {
        .slider-container {
            display: block;
        }
    }
}

.viewport-size-active {
    background: #ddd;
}