.panel-heading .nav {
    display: flex;
    justify-content: center;
    border-radius: 6px 6px 0 0;
    background-color: #FFFFFF;
}

.panel-heading .nav .item.active {
    font-weight: 600;
    color: #333333;
}
.panel-heading .nav .item {
    height: 60px;
    padding-left: 30px;
    font-weight: 500;
    font-size: 16px;
    line-height: 60px;
    color: #999999;
    cursor: pointer;
    transition: 0.4s;
}

.panel-heading .nav .item+.item {
    margin-left: 110px;
}