.i-popup{
    display: none;
    position: absolute;
    z-index: 100;
    box-shadow: 0 0 0 1px rgba(0,0,0,.1), 0 10px 20px -5px rgba(0,0,0,.4);
    background: #fff;
    margin: 0;
    padding: 0;

    &__tail{
        position: absolute;
        background: linear-gradient(
                to bottom right,
                #fff,
                #fff 55%,
                transparent 55%
            );
        box-shadow: -1px -1px 0 0 rgba(0,0,0,.1);
    }
}

body.i-popup__noscroll{
    position:fixed;
    overflow:hidden;
}