#customers {
  font-family: Arial, Helvetica, sans-serif;
  border-collapse: collapse;
  width: 100%;
}

#customers td, #customers th {
  border: 1px solid #ddd;
  padding: 8px;
}

#customers tr:nth-child(even){background-color: #f2f2f2;}

#customers tr:hover {background-color: #ddd;}

#customers th {
  padding-top: 12px;
  padding-bottom: 12px;
  text-align: left;
  background-color: #4CAF50;
  color: white;
}


.c_border {
  border: 2px solid #138496 ;
  padding: 20px;
  border-radius : 10px;
  max-width : 500px;
}


@media screen and (max-width:500px){
 .c_border {  
  max-width : 300px;
}
}