.seo__spoiler {
    overflow: hidden;
    position: relative;
    transition: max-height 0.5s ease-in;
    max-height: 1000px;
}

.seo__spoiler.seo__spoiler_hide {
    max-height: 150px!important;
}

.seo__spoiler.seo__spoiler_hide:after {
    content: "";
    display: block;
    height: 100px;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0), #fff 75%)
}

.seo {
    padding: 30px 0;
}

.seo__spoiler-text {
    padding-bottom: 20px;
}

.js-spoiler-toggle {
    display: block;
    margin: 0 auto;
    width: 100px;
}