* {
        margin: 0;
        padding: 0;
        font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
        box-sizing: border-box;
    }

    main {
        font-size: 18px;
    }

    main ul,
    ol {
        padding: 10px 0 10px 20px;
    }

    main li {
        padding: 2px 0;
        line-height: 1.6em;
        list-style: none;
        position: relative;
    }

    main li:before {
        content: '';
        width: 10px;
        height: 10px;
        background: #ffcc18;
        position: absolute;
        border-radius: 100%;
        top: 10px;
        left: -15px;
    }

    main h1 {
        padding: 10px 0;
        color: rgba(68, 70, 72, 1.0);
        font-size: 1.6em;
    }

    main h2 {
        font-size: 1.2em;
        padding: 20px 0 0 0;
        display: block;
        width: 100%;
        text-indent: 1.5em;
    }

    main h3 {
        font-size: 1.1em;
        color: black;
        padding: 20px 0;
        display: block;
    }

    main p {
        padding: 10px 0;
        line-height: 1.6em;
        text-indent: 1.5em;
    }

    main span {
        display: block;
        padding-bottom: 10px;
    }

    main i,
    strong {
        color: black;
    }

    main .flex-container {
        display: flex;
        align-items: flex-end;
    }

    main .flex-container .img-block:nth-child(2) {
        margin-left: 20px;
    }

    main .flex-container .img-block:nth-child(1) {
        margin-right: 20px;
    }

    main .two-items {
        width: calc(100% / 2);
    }

    main .four-items {
        width: calc(100% / 4);
    }

    main .img-block {
        text-align: center;
    }

    main .img-block img {
        width: 100%;
    }

    main .img-block i {
        font-size: 14px;
    }

    main p.names {
        padding-bottom: 0;
    }

    main p.expert-opinion {
        padding-top: 0;
    }

    main .pch-control,
    main .transfomers {
        max-width: 300px;
        width: 100%;
        min-height: 300px;
        height: 100%;
        margin-right: 50px;
        text-align: center;
    }

    .sertificat {
      width: 40%;
    }

    @media (max-width: 768px) {
        main .flex-container {
            flex-wrap: wrap;
        }
        main .four-items {
            width: calc(100% / 2);
        }
        .sertificat {
          width: 60%;
        }
    }

    @media (max-width: 480px) {
        main .four-items,
        main .two-items {
            width: 100%;
            margin-right: 0;
        }
        .sertificat {
          width: 80%;
        }
    }