.main-page-block {
        position: relative;
    }
    
    .main-page-block:before {
        content: '';
        position: absolute;
        background: url(https://fs.getcourse.ru/fileservice/file/download/a/368091/sc/100/h/8b1ff822293ad9b07420676c5cde6702.png);
        width: 100%;
       height: 375px;
        background-size: cover;
        top: -15px;
       transform: scale(1, -1);
    }

    /*.main-page-block:after {
    content: '';
    position: absolute;
    background: url(https://cdn.accelonline.io/C0PcKu2FskWHmOGEw57-Kg/images/6L8vjC9MTkmfhaka2Ytj1w.png);
    width: 300px;
    height: 300px;
    background-size: cover;
    bottom: 0;
    left: -20px;
    transform: scale(-1, -1);
    z-index: -1;
}*/