@media screen and (max-width: 760px) {
    header{
        flex-direction: column;
     }

     ul{
        text-align: center;
     }

     main{
        flex-direction: column;
     }

     h2{
        font-size: 28px;
     }

     form{
      margin: 0 auto;  
      width: 100%;
     }

     input{
        align-self: center;
     }

     img{
        display: none;
     }
}