.flex{
    display: flex;
}
.justify-center{
    justify-content: center;
}
.align-center{
    align-items: center;
}
.border{
    border: 1px solid #ccc;   
}
.margin{
    padding:10px;
}
.outline{
    outline:none;
}
.invert{
    filter: invert(1);
}
.inver{
    filter:grayscale(50%)
}