.box {
width: 555px;
padding: 10px;
background-color: #EBFCFF ;
border: 7px solid #F5FFFF ;
margin: 0;
}

@media screen and (max-width:768px){
  .box {
    max-width: 90%;   
  }
  .mks_col .mks_one_quarter {
    width: 100%;
    margin-left: 10%;
  }
  .mks_col [class*="mks_"]:first-child {
    margin-left: 10%;
}
}

@media screen and (max-width:500px){
  .box {
    max-width: 90%;   
  }
  .mks_col .mks_one_quarter {
    width: 100%;
    margin-left: 0.5%;
  }
  .mks_col [class*="mks_"]:first-child {
    margin-left: 0.5%;
}
}