.slider-content {
    height: 205px;
    margin: 0 auto;
}
#block-for-slider {
    position: relative;
    margin: 0 auto;
}

#viewport-slider {
    width: calc(100% - 30px);
    margin-left: 15px;
    position: relative;
    overflow: hidden;
}

#slidewrapper {
    position: relative;
    width: calc(100% * 17);
    right: 0;
    margin: 0;
    padding: 0;
}

#slidewrapper li {
    width: calc(100%/17);
    list-style: none;
    display: inline;
    float: left;
}

.slide-img {
    width: 100%;
    height: 205px;
}

#prev-btn,
#next-btn {
    position: absolute;
    height: calc(100% - 4px);
    top: 0;
    background-color: #e8e8e8;
    width: 15px;
}

#prev-btn {
    left: 0;
    height: 100%;
}

#next-btn {
    right: 0;
    height: 100%;
}

#prev-next-btns img {
    position: absolute;
    width: 10px;
    left: 2.5px;
    top: calc((100% - 15px) / 2);
}
@media screen and (max-width: 780px) {
    #block-for-slider {
        width: 100%;
    }
}