.image-slider-container {
    position: relative;
}

.image-slider-container .images {
    height: 100%;
    position: relative;
    overflow: hidden;
}

.image-slider-container .images .img {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
}

.image-slider-container .btn {
    background: #7f7f7f;
    width: 3em;
    height: 3em;
    top: 0;
    bottom: 0;
    margin: auto;
    border-radius: 50%;
    cursor: pointer;
    position: absolute;
    color: #fff;
    transition: all .5s;
    opacity: .2;
}

.image-slider-container .btn:hover {
    opacity: 1;
}

.image-slider-container .prev-btn {
    left: 20px;
}

.image-slider-container .next-btn {
    right: 20px;
}