ul{
    list-style-type: none !important;
}
@media screen and (min-width: 600px) {
    .tabcontent {
      
        width: 80%;
     
    }
    .tab {
       /* width: 20%;*/
        height: 700px;
    }
    #btnexp {
        margin-left: 400px;
    }
}

@media screen and (max-width: 600px) {
    .tabcontent {
    
       width: 60%;
       
    }

    .tab {
     /*   width: 30%;*/
        height: 100%;
    }
    #btnexp {
        margin-left: 100px;
    }
}