.fib,
.fi {
    background-size: contain;
    background-position: 50%;
    background-repeat: no-repeat;
}

.fi {
    position: relative;
    display: inline-block;
    width: 1.333333em;
    line-height: 1em;
}

.fi:before {
    content: " ";
}

.fi.fis {
    width: 1em;
}

.fi-cz {
    background-image: url(../img/flags/4x3/cz.svg);
}

.fi-cz.fis {
    background-image: url(../img/flags/1x1/cz.svg);
}

.fi-gb {
    background-image: url(../img/flags/4x3/gb.svg);
}

.fi-gb.fis {
    background-image: url(../img/flags/1x1/gb.svg);
}