.navbar{
    display: flex;
    margin: 0 auto;
    max-width: max-content;
}
.navbar ul{
    display:flex;
    flex-wrap: wrap;
    justify-content: center;
}
.navbar li{
    margin: 10px;
    display:block
}

.bar{
    position: relative;
    transition: all 0.3s;
    cursor: pointer;
    box-sizing: inherit;
}
.bartext{
    position: absolute;
    text-align: center;
    top:0 px;
    transition: all 0.3s;
    color:rgb(255, 255, 255);
    background-color: rgba(128, 128, 128, 0.7);
    border-radius: 4px;
    font-family: Arial, Helvetica, sans-serif; 
    filter: initial;
    font-size: 30px;
    width: 260px;
    margin: 10px;
    padding: 5px;
    min-height: 30px;
    z-index: 3;
}
.barback{
    margin-top:10px;
    left:0px;
    z-index: 2;
}
.navbar li:hover .bar{
    transform: rotateY(180deg); 
}
.navbar li:hover .bartext{
    color:rgba(0, 0, 0, 0);
    background-color: rgba(0, 0, 0, 0);
}