@media only screen and (min-width: 1000px) {
  .my_form_left {    
    display: inline-block !important;    
    float: left !important;    
    margin-right: 1% !important;
    margin-top: 1px !important;        
    width: 49% !important;
  }
  .my_form_right {    
    display: inline-block !important;    
    float: left !important;    
    margin-left: 1% !important;    
    margin-top: 1px !important;        
    width: 49% !important;
  }
}<br>

div.wpcf7-response-output.wpcf7-validation-ok {color: #ffffff; background-color: #99b3c4 !important;}