ul.service-nav {
  padding-left: 0;
  list-style: none !important;
  display: flex;
  flex-wrap: wrap;
  margin-left: -30px;
  margin-right: -30px;
}
.service-nav li {
  flex: 0 0 25%;
  list-style: none !important;
}
.service-nav li a {
  display: block;
  margin: 0 10px 50px;
  color: #222;
  font-size: 18px;
  text-decoration: none !important;
  text-align: center;
}
.service-nav li a img {
  max-width: 100%;
  display: block;
  margin: 0 auto 7px;
}
.service-nav li a:hover img {
  opacity: 0.7;
}
@media screen and (max-width: 767.98px) {
  ul.service-nav {
    margin-left: -10px;
    margin-right: -10px;
  }
  .service-nav li {
    flex: 0 0 50%;
  }
  .service-nav li a {
    margin: 0 10px 30px;
    font-size: 15px;
  }
}