.content_main {
    margin-top: 20px;
}

.content_main .wrapper {
    height: 110px;
}

@media (max-width: 1170px) {  
    .content_main {
        margin-top: 0px !important;
    }

    .content_main .chapter_1  .wrapper {
        height: auto !important;
    }   
    
    .content_main .chapter_2,
    .content_main .chapter_3
    {
        margin-top: 20px;
    }
}