.block-big-title {
    padding: 0 0 2.6vw;
}

.block-big-title h1 {
    font-size: 5.8vw;
    margin: 0;
    padding: 0;
    font-weight: bold;
}

.block-big-title:after {
    content: "";
    display: block;
    width: 100%;
    border-bottom: 1px solid #d3d3d3;
    padding-top: 20px;
}

@media (min-width: 992px) {
    .block-big-title h1 {
        font-size: 2.3vw;
    }

    .block-big-title:after {
        padding-top: 2vw;
    }
}