.not-hack {
    width: -webkit-calc(30% + 1px);
    width: calc(30% + 1px);
    display: -webkit-box;
    display: flex;
    transition: -webkit-filter 1s, filter 1s;
}

.not-hack2 {
    transition: -webkit-filter 1s;
    transition: filter 1s;
}

.hack {
    width: -webkit-calc(30% + 1px);
    display: -webkit-box;
}
