body {
    background-color: #303030;
}

.allvisible {
    visibility: visible;
}

.interactive-blocks {
    visibility: visible;
    z-index: 1;
}

.sidebar {
    visibility: visible;
    position: fixed;
    background-color: #1b1919;
    height: 100vh;
    width: 200px;
    top: 0;
    left: 0;
    z-index: 1000;
}

.top_site_menu {
    position: fixed;
    background-color: #272424;
    width: 100vw;
    height: 80px;
    top: 0;
    left: 0;
    z-index: 999;
}

.ads-block {
    background-color: #555252;
    border-radius: 32px;
    position: relative;
    width: 1398px; /*от 1500 - 102 */
    height: 400px;
    top: 130px;
    left: 310px;
}

.all-cases {
    position: relative;
}

.first-case {
    position: relative;
    border-radius: 32px;
    background-color: #555252;
    width: 415px;
    height: 500px;
    top: 230px;
    left: 310px;
}

.second-case {
    position: relative;
    border-radius: 32px;
    background-color: #555252;
    width: 415px;
    height: 500px;
    top: -270px;
    left: 802px;
}

.third-case {
    position: relative;
    border-radius: 32px;
    background-color: #555252;
    width: 415px;
    height: 500px;
    top: -770px;
    left: 1293px;
}