.our-img{
    height: 150px;
    background-color: red;
}
@media screen and (max-width: 800px) {
    .our-img{
        height: 50px;
        background-color: green;
    }

    .gtm{
        margin-top: 100px;
    }
    .talk{
        display: none;
    }
    .about-img{
        margin-top: 100px;
    }
    .innovation{
margin-top:-50px;
    }
    .performance{
        margin-top:-50px;
    }
  }