@media screen and (max-width: 767px){
  #menuinsta > div > div > div > li.slick-slide:nth-child(1) > a:before {
  background-image:url(https://cdn.awsli.com.br/2910/2910962/arquivos/categ-1.png);}
  #menuinsta > div > div > div > li.slick-slide:nth-child(2) > a:before {
  background-image:url(https://cdn.awsli.com.br/2910/2910962/arquivos/categ-2.png);}
}