.add-select {
    position: relative;
}
.add-select .hidden {
    display: none;
}
.add-select .options {
    position: absolute;
    left: 0;
    top: 100%;
    display: none;
    background: #fff;
    width: 100%;
    max-height: 250px;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 2;
    display: none;
    opacity: 0;
    transition: opacity 0.1s ease;
    -webkit-transition: opacity 0.1s ease;
}
.add-select.active .options {
    opacity: 1;
}
.add-select .option {
    text-overflow: ellipsis;
    overflow: hidden;
    cursor: pointer;
    white-space: nowrap;
}
.add-select .title {
    position: relative;
    cursor: pointer;
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
}
.add-select .title .inner {
    display: inline-block;
    max-width: 100%;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    vertical-align: middle;
}