div.custom-select ul {
    display: block;
    opacity: 0;
    visibility: hidden;
    transition: .2s;
}
div.custom-select._opened ul {
    opacity: 1;
    visibility: visible;
    transition: .2s;
}
ul.custom-select__list > li {
    color: #89929c;
}
ul.custom-select__list > li:hover{
    background: #ccf6ff;
    cursor: pointer;
}
ul.custom-select__list > li._selected{
    background: #ccf6ff;
}