@media only screen and (max-width: 767px) {
    
    .container { 
      max-width: 767px;
      min-width: 300px;
      width: 90%;
    }
    
    .container .one.column,
    .container .one.columns,
    .container .two.columns,
    .container .three.columns,
    .container .four.columns,
    .container .five.columns,
    .container .six.columns,
    .container .seven.columns,
    .container .eight.columns,
    .container .nine.columns,
    .container .ten.columns,
    .container .eleven.columns,
    .container .twelve.columns,
    .container .thirteen.columns,
    .container .fourteen.columns,
    .container .fifteen.columns,
    .container .sixteen.columns,
    .container .one-third.column,
    .container .two-thirds.column  { 
      width: 100%;
    }
}