.about-our-values .box img { margin-right: 40px; }
.about-our-values .box:nth-child(2) img,
.about-our-values .box:nth-child(4) img { margin-right: 0; }

@media screen and (max-width: 992px) {   
    .about-our-values .box img { margin-right: 10px; }
}

@media screen and (max-width: 768px) {
    .about-our-values .box img { margin-right: 0; }
}